钙钛矿(结构)
掺杂剂
光伏系统
卤化物
图层(电子)
兴奋剂
能量转换效率
电导率
材料科学
光电子学
传输层
化学工程
纳米技术
化学
无机化学
有机化学
物理化学
电气工程
工程类
作者
Zhen Song,Jiang Liu,Gang Wang,Wentao Zuo,Cheng Liao,Jun Mei
出处
期刊:ChemPhysChem
[Wiley]
日期:2017-09-18
卷期号:18 (21): 3030-3038
被引量:12
标识
DOI:10.1002/cphc.201700910
摘要
Lead halide perovskite solar cells with remarkable power conversion efficiency have attracted much attention in recent years. However, there still exist many problems with their use that are not completely understood, and further studies are needed. Herein, the hole-transport layer dependence of the photovoltaic performance of perovskite solar cells is investigated in detail. It is found that devices freshly prepared using pristine 2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) and Li-doped spiro-OMeTAD as hole-transport layers exhibit S-shaped current density–voltage curves with poor fill factors. The devices show progressively improved fill factors and efficiencies upon exposure to air, which is attributed to air-induced conductivity improvement in the spiro-OMeTAD layer. After introducing a cobalt salt dopant (FK209) into the spiro-OMeTAD layer, the corresponding devices show remarkable performance without the need of air exposure. These results confirm that the dopant not only increases the conductivity of spiro-OMeTAD layer, but also tunes the surface potential, which helps to improve charge transport and reduce the recombination loss.
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