Improved planar perovskite solar cells using the modified hole transporting layer and solvent annealing

33rd International Conference on the Physics of Semiconductors

Pang, Shangzheng^1 ; Zhang, Chunfu^1 ; Chen, Dazheng^1 ; Hao, Yue^1

State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University, Xi'an

710071, China^1

关键词: Electric transport;    High-efficiency solar cells;    Hole transporting layers;    Light absorbers;    Low conductivity;    Perovskite layers;    Planar heterojunction structures;    Solvent annealing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/864/1/012008/pdf
DOI  :  10.1088/1742-6596/864/1/012008

来源: IOP

【 摘 要 】

Organometal trihalide perovskites have been demonstrated as excellent light absorbers for high efficiency solar cell [1]. In this work, Glass/ITO/PEDOT:PSS/Perovskite/PCBM/Ag planar heterojunction structure was designed and investigated. For the reference cell, the efficiency of 12.5 % was achieved. An relative low Jscwas exhibited at the result, mainly owing to the low conductivity of the electric transport layer - PEDOT:PSS. By controlling the amount of DMSO doped in PEDOT:PSS, a superior device was obtained with the efficiency of 13.6% although the roughness of the PEDOT:PSS layer was also increasing with doping DMSO. Furthermore, another key factor for a perovskite solar cell is the high crystallization of the perovskite layer[2]. Solvent annealing was adopted to improve the crystallization in this work. With dropping IPA around the solar cell and annealing for 20 minute, a surprising characteristics of the device with the efficiency of 15%, VOCof 0.99 V, Fill Factor of 67.9%, JSCof 22.3mA/cm2was obtained.