Inverted planar perovskite solar cells with efficient and stability via optimized cathode-interfacial layer

被引:5
|
作者
Zhao, Zhiqiang [1 ]
Huang, Jing [1 ]
Cao, Yang [1 ]
Sun, Zhu-Zhu [1 ]
Cheng, Nian [1 ]
Sun, Shujie [1 ]
Sun, Haibin [1 ]
You, Shuai [1 ]
机构
[1] Xinyang Normal Univ, Energy Saving Bldg Mat Collaborat Innovat Ctr Hen, 237 Nanhu Rd, Xinyang 464000, Peoples R China
基金
中国国家自然科学基金;
关键词
Perovskite; Carrier transfer; Stability; Dipole layer; Hydrophobic; ELECTRON-TRANSPORT; COUNTER ELECTRODE; PCBM; CONDUCTIVITY; ENHANCEMENT; PERFORMANCE; INTERLAYER;
D O I
10.1016/j.solener.2020.07.050
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Among the factors that lead to the reduction of the efficiency and stability of perovskite solar cells (PSCs) using [6,6] -phenyl C61 butyric acid methyl ester (PCBM) versus those of conventional structure, is the difficulty involved in realizing a high-quality film, and the non-radiative recombination that takes place at the interface between PCBM and perovskite. Our present work proposes a fabrication technique capable of overcoming these issues. Organic small molecule material was introduced along with PCBM, to obtain a homogeneously seamless film that plays the role of a dipole layer. The incorporated triethyl citrate (TEC) boosts the power conversion efficiency (PCE) from 14.56% to 17.86% with suppressed hysteresis, which originates primarily from the efficient electron transfer between the perovskite/PCBM and the Ag cathode interface. The results of electrochemical impedance spectroscopy measurements imply efficient electron transfer, low series resistance, and large recombination resistance in the photovoltaic device employing PCBM@TEC as the cathode interfacial layer. Specifically, the highly hydrophobic PCBM@TEC cathode interfacial layer (CIL) showed higher resistance to moisture, leading to a more environmentally-stable device. The results also showed the efficiency of the device retained 84% of its initial value after 30 days of operation under ambient conditions, which shows a visibly superior stability compared to a reference device that, under the same environment, retained only 37% its initial efficiency. Such advancement in the operational efficiency and stability of the device, will contribute to the longevity and cost-effectiveness of inverted PSC devices.
引用
收藏
页码:1165 / 1171
页数:7
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