材料科学
兴奋剂
钙钛矿(结构)
锂(药物)
化学工程
半导体
电导率
紫外线
光电子学
化学
物理化学
医学
工程类
内分泌学
作者
Jaemin Kong,Yongwoo Shin,Jason A. Röhr,Hang Wang,Juan Meng,Yueshen Wu,Adlai Katzenberg,Geunjin Kim,Dong Young Kim,Tai-De Li,Edward Chau,Francisco Antônio,Tana Siboonruang,Sooncheol Kwon,Kwanghee Lee,Jin Ryoun Kim,Miguel A. Modestino,Hailiang Wang,André D. Taylor
出处
期刊:Nature
[Springer Nature]
日期:2021-06-02
卷期号:594 (7861): 51-56
被引量:139
标识
DOI:10.1038/s41586-021-03518-y
摘要
In perovskite solar cells, doped organic semiconductors are often used as charge-extraction interlayers situated between the photoactive layer and the electrodes. The π-conjugated small molecule 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9-spirobifluorene (spiro-OMeTAD) is the most frequently used semiconductor in the hole-conducting layer1,2,3,4,5,6, and its electrical properties considerably affect the charge collection efficiencies of the solar cell7. To enhance the electrical conductivity of spiro-OMeTAD, lithium bis(trifluoromethane)sulfonimide (LiTFSI) is typically used in a doping process, which is conventionally initiated by exposing spiro-OMeTAD:LiTFSI blend films to air and light for several hours. This process, in which oxygen acts as the p-type dopant8,9,10,11, is time-intensive and largely depends on ambient conditions, and thus hinders the commercialization of perovskite solar cells. Here we report a fast and reproducible doping method that involves bubbling a spiro-OMeTAD:LiTFSI solution with CO2 under ultraviolet light. CO2 obtains electrons from photoexcited spiro-OMeTAD, rapidly promoting its p-type doping and resulting in the precipitation of carbonates. The CO2-treated interlayer exhibits approximately 100 times higher conductivity than a pristine film while realizing stable, high-efficiency perovskite solar cells without any post-treatments. We also show that this method can be used to dope π-conjugated polymers.
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