Thermally stable methylammonium-free inverted perovskite solar cells with Zn2+ doped CuGaO2 as efficient mesoporous hole-transporting layer

被引:88
作者
Chen, Yu [1 ,2 ]
Yang, Zhou [3 ]
Jia, Xuguang [2 ]
Wu, Yihui [1 ,2 ]
Yuan, Ningyi [2 ]
Ding, Jianning [2 ,4 ]
Zhang, Wen-Hua [1 ]
Liu, Shengzhong [3 ]
机构
[1] China Acad Engn Phys, Inst Chem Mat, Sichuan Res Ctr New Mat, 596 Yinhe Rd, Chengdu 610200, Sichuan, Peoples R China
[2] Changzhou Univ, Jiangsu Prov Cultivat Base, State Key Lab Photovolta Sci & Technol, Changzhou 213164, Jiangsu, Peoples R China
[3] Shaanxi Normal Univ, Sch Mat Sci & Engn, Xian 710119, Shaanxi, Peoples R China
[4] Jiangsu Univ, Miro Nano Sci & Technol Ctr, Zhenjiang 212013, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Inorganic hole transporting materials; Doping; Energy alignment; Stability; Perovskite solar cells; HIGH-PERFORMANCE; DELAFOSSITE CUGAO2; SPIRO-OMETAD; V HYSTERESIS; EXTRACTION; CONDUCTIVITY;
D O I
10.1016/j.nanoen.2019.04.042
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Despite incredible success has been achieved for perovskite solar cells (PSCs) in pursuing high power conversion efficiency (PCE), their practical application is prevented by the low stability issues, especially an accelerating stability test at high temperature still needs to be demonstrated. Herein, we present an inverted mesoscopic PSCs with Zn2+ doped CuGaO2 (Zn:CuGaO2) as both the scaffold and hole transporting materials (HTM). Both theoretical and experimental results indicate that the carrier density and conductivity of CuGaO2 is significantly improved via Zn2+ doping, which is beneficial for the hole transfer. Moreover, the mesoporous structure combined with the well matched energy levels between Zn:CuGaO2 and perovskite can effectively extract holes from perovskite, reduce charge transfer barrier, and depress the charge-carrier recombination. As a result, the champion device with Zn:CuGaO2 as HTM gives a power conversion efficiency of 20.67% from reverse scan and a stabilized efficiency of 20.15%, which is among the best results for PSCs based on methylammonium-free, cesium-formamidinium (Cs-FA) double-cation perovskite and inorganic HTM. Moreover, PCE of the unencapsulated device retains over 85% after thermal annealing at 85 degrees C for 1000 h in a nitrogen atmosphere, demonstrating the superior thermal stability of the present PSCs with the metal doped inorganic HTM.
引用
收藏
页码:148 / 157
页数:10
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