共 50 条
[31]
Progress and Challenges Toward Effective Flexible Perovskite Solar Cells
[J].
Li, Xiongjie
;
Yu, Haixuan
;
Liu, Zhirong
;
Huang, Junyi
;
Ma, Xiaoting
;
Liu, Yuping
;
Sun, Qiang
;
Dai, Letian
;
Ahmad, Shahzada
;
Shen, Yan
;
Wang, Mingkui
.
NANO-MICRO LETTERS,
2023, 15 (01)

Li, Xiongjie
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Yu, Haixuan
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Liu, Zhirong
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Huang, Junyi
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Ma, Xiaoting
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Liu, Yuping
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Sun, Qiang
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Dai, Letian
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Ahmad, Shahzada
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Basque Country, Basque Ctr Mat Applicat & Nanostruct, BCMat, Sci Pk, Leioa 48940, Spain
Ikerbasque, Basque Fdn Sci, Bilbao 48009, Spain Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Shen, Yan
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China

Wang, Mingkui
论文数: 0 引用数: 0
h-index: 0
机构:
Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, 1037 Luoyu Rd, Wuhan 430074, Hubei, Peoples R China
[32]
Progress and Challenges Toward Effective Flexible Perovskite Solar Cells
[J].
Xiongjie Li
;
Haixuan Yu
;
Zhirong Liu
;
Junyi Huang
;
Xiaoting Ma
;
Yuping Liu
;
Qiang Sun
;
Letian Dai
;
Shahzada Ahmad
;
Yan Shen
;
Mingkui Wang
.
Nano-Micro Letters,
2023, 15

Xiongjie Li
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Haixuan Yu
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Zhirong Liu
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Junyi Huang
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Xiaoting Ma
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Yuping Liu
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Qiang Sun
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Letian Dai
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Shahzada Ahmad
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Yan Shen
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics

Mingkui Wang
论文数: 0 引用数: 0
h-index: 0
机构: Huazhong University of Science and Technology,Wuhan National Laboratory for Optoelectronics
[33]
Transition of Perovskite Solar Technologies to Being Flexible
[J].
Castriotta, Luigi Angelo
;
Uddin, Md Aslam
;
Jiao, Haoyang
;
Huang, Jinsong
.
ADVANCED MATERIALS,
2025, 37 (08)

Castriotta, Luigi Angelo
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Roma Tor Vergata, CHOSE Ctr Hybrid & Organ Solar Energy, Dept Elect Engn, Via Politecn 1, I-00133 Rome, Italy
Univ North Carolina Chapel Hill, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA Univ Roma Tor Vergata, CHOSE Ctr Hybrid & Organ Solar Energy, Dept Elect Engn, Via Politecn 1, I-00133 Rome, Italy

Uddin, Md Aslam
论文数: 0 引用数: 0
h-index: 0
机构:
Perotech Inc, Kenan Lab B825, 125 South Rd, Chapel Hill, NC 27599 USA Univ Roma Tor Vergata, CHOSE Ctr Hybrid & Organ Solar Energy, Dept Elect Engn, Via Politecn 1, I-00133 Rome, Italy

Jiao, Haoyang
论文数: 0 引用数: 0
h-index: 0
机构:
Univ North Carolina Chapel Hill, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA Univ Roma Tor Vergata, CHOSE Ctr Hybrid & Organ Solar Energy, Dept Elect Engn, Via Politecn 1, I-00133 Rome, Italy

Huang, Jinsong
论文数: 0 引用数: 0
h-index: 0
机构:
Univ North Carolina Chapel Hill, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA
Univ North Carolina Chapel Hill, Dept Chem, Chapel Hill, NC 27599 USA Univ Roma Tor Vergata, CHOSE Ctr Hybrid & Organ Solar Energy, Dept Elect Engn, Via Politecn 1, I-00133 Rome, Italy
[34]
Comparative architecture in monolithic perovskite/silicon tandem solar cells
[J].
Sayantan Mazumdar
;
Ying Zhao
;
Xiaodan Zhang
.
Science China Physics, Mechanics & Astronomy,
2023, 66

论文数: 引用数:
h-index:
机构:

Ying Zhao
论文数: 0 引用数: 0
h-index: 0
机构: Nankai University,Institute of Photoelectronic Thin Film Devices and Technology, Renewable Energy Conversion and Storage Center, Solar Energy Conversion Center

Xiaodan Zhang
论文数: 0 引用数: 0
h-index: 0
机构: Nankai University,Institute of Photoelectronic Thin Film Devices and Technology, Renewable Energy Conversion and Storage Center, Solar Energy Conversion Center
[35]
Comparative architecture in monolithic perovskite/silicon tandem solar cells
[J].
Mazumdar, Sayantan
;
Zhao, Ying
;
Zhang, Xiaodan
.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,
2023, 66 (01)

Mazumdar, Sayantan
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Renewable Energy Convers & Storage Ctr, Solar Energy Convers Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China
Haihe Lab Sustainable Chem Transformat, Tianjin 300192, Peoples R China
Minist Educ, Engn Res Ctr Thin Film Photoelect Technol, Tianjin 300350, Peoples R China
Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China Nankai Univ, Renewable Energy Convers & Storage Ctr, Solar Energy Convers Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China

Zhao, Ying
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Renewable Energy Convers & Storage Ctr, Solar Energy Convers Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China
Haihe Lab Sustainable Chem Transformat, Tianjin 300192, Peoples R China
Minist Educ, Engn Res Ctr Thin Film Photoelect Technol, Tianjin 300350, Peoples R China
Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China Nankai Univ, Renewable Energy Convers & Storage Ctr, Solar Energy Convers Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China

Zhang, Xiaodan
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Renewable Energy Convers & Storage Ctr, Solar Energy Convers Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China
Haihe Lab Sustainable Chem Transformat, Tianjin 300192, Peoples R China
Minist Educ, Engn Res Ctr Thin Film Photoelect Technol, Tianjin 300350, Peoples R China
Collaborat Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300072, Peoples R China Nankai Univ, Renewable Energy Convers & Storage Ctr, Solar Energy Convers Ctr, Inst Photoelect Thin Film Devices & Technol, Tianjin 300350, Peoples R China
[36]
Degradation mechanism for planar heterojunction perovskite solar cells
[J].
Yamamoto, Kouhei
;
Furumoto, Yoshikazu
;
Shahiduzzaman, M.
;
Kuwabara, Takayuki
;
Takahashi, Kohshin
;
Taima, Tetsuya
.
JAPANESE JOURNAL OF APPLIED PHYSICS,
2016, 55 (04)

Yamamoto, Kouhei
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

Furumoto, Yoshikazu
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

Shahiduzzaman, M.
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

Kuwabara, Takayuki
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

Takahashi, Kohshin
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan

Taima, Tetsuya
论文数: 0 引用数: 0
h-index: 0
机构:
Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan
Kanazawa Univ, Inst Frontier Sci Initiat InFIniti, Kanazawa, Ishikawa 9201192, Japan Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa 9201192, Japan
[37]
Unveiling the operation mechanism of layered perovskite solar cells
[J].
Lin, Yun
;
Fang, Yanjun
;
Zhao, Jingjing
;
Shao, Yuchuan
;
Stuard, Samuel J.
;
Nahid, Masrur Morshed
;
Ade, Harald
;
Wang, Qi
;
Shield, Jeffrey E.
;
Zhou, Ninghao
;
Moran, Andrew M.
;
Huang, Jinsong
.
NATURE COMMUNICATIONS,
2019, 10 (1)

Lin, Yun
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Fang, Yanjun
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Zhao, Jingjing
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Shao, Yuchuan
论文数: 0 引用数: 0
h-index: 0
机构:
Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Stuard, Samuel J.
论文数: 0 引用数: 0
h-index: 0
机构:
North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Nahid, Masrur Morshed
论文数: 0 引用数: 0
h-index: 0
机构:
North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Ade, Harald
论文数: 0 引用数: 0
h-index: 0
机构:
North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Wang, Qi
论文数: 0 引用数: 0
h-index: 0
机构:
Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Shield, Jeffrey E.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Zhou, Ninghao
论文数: 0 引用数: 0
h-index: 0
机构:
Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Moran, Andrew M.
论文数: 0 引用数: 0
h-index: 0
机构:
Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA

Huang, Jinsong
论文数: 0 引用数: 0
h-index: 0
机构:
Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA Univ Nebraska, Dept Mech & Mat Engn, Lincoln, NE 68588 USA
[38]
Basic understanding of perovskite solar cells and passivation mechanism
[J].
Yu, Yixin
;
Xia, Jingxuan
;
Liang, Yiwen
.
AIP ADVANCES,
2022, 12 (05)

Yu, Yixin
论文数: 0 引用数: 0
h-index: 0
机构:
Changchun Univ Sci & Technol, Coll Sci, Changchun, Jilin, Peoples R China Changchun Univ Sci & Technol, Coll Sci, Changchun, Jilin, Peoples R China

Xia, Jingxuan
论文数: 0 引用数: 0
h-index: 0
机构:
Changchun Univ Sci & Technol, Coll Sci, Changchun, Jilin, Peoples R China Changchun Univ Sci & Technol, Coll Sci, Changchun, Jilin, Peoples R China

Liang, Yiwen
论文数: 0 引用数: 0
h-index: 0
机构:
Changchun Univ Sci & Technol, Coll Sci, Changchun, Jilin, Peoples R China Changchun Univ Sci & Technol, Coll Sci, Changchun, Jilin, Peoples R China
[39]
Low-Temperature Processable Charge Transporting Materials for the Flexible Perovskite Solar Cells
[J].
Jo, Jea Woong
;
Yoo, Yongseok
;
Jeong, Taehee
;
Ahn, SeJin
;
Ko, Min Jae
.
ELECTRONIC MATERIALS LETTERS,
2018, 14 (06)
:657-668

Jo, Jea Woong
论文数: 0 引用数: 0
h-index: 0
机构:
Dongguk Univ, Dept Energy & Mat Engn, Seoul 04620, South Korea Dongguk Univ, Dept Energy & Mat Engn, Seoul 04620, South Korea

Yoo, Yongseok
论文数: 0 引用数: 0
h-index: 0
机构:
Hanyang Univ, Dept Chem Engn, 222 Wangsimni Ro, Seoul 04763, South Korea Dongguk Univ, Dept Energy & Mat Engn, Seoul 04620, South Korea

Jeong, Taehee
论文数: 0 引用数: 0
h-index: 0
机构:
Hanyang Univ, Dept Chem Engn, 222 Wangsimni Ro, Seoul 04763, South Korea Dongguk Univ, Dept Energy & Mat Engn, Seoul 04620, South Korea

Ahn, SeJin
论文数: 0 引用数: 0
h-index: 0
机构:
Korea Inst Energy Res, Photovolta Lab, Daejeon 34129, South Korea Dongguk Univ, Dept Energy & Mat Engn, Seoul 04620, South Korea

论文数: 引用数:
h-index:
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[40]
Preparation of hysteresis-free flexible perovskite solar cells via interfacial modification
[J].
Ye, Xiaofang
;
Cai, Hongkun
;
Su, Jian
;
Yang, Jingtao
;
Ni, Jian
;
Li, Juan
;
Zhang, Jianjun
.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,
2021, 61
:213-220

Ye, Xiaofang
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China

Cai, Hongkun
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China

Su, Jian
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China

Yang, Jingtao
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China

Ni, Jian
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China

Li, Juan
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China

Zhang, Jianjun
论文数: 0 引用数: 0
h-index: 0
机构:
Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China
Key Lab Photoelect Thin Film Devices & Technol Ti, Tianjin 300350, Peoples R China Nankai Univ, Coll Elect Informat & Opt Engn, Dept Elect Sci & Technol, Tianjin 300350, Peoples R China