材料科学
介孔材料
钙钛矿(结构)
平面的
光电子学
化学工程
图层(电子)
介观物理学
热稳定性
纳米技术
光伏系统
物理
化学
催化作用
工程类
计算机图形学(图像)
生态学
生物
量子力学
生物化学
计算机科学
作者
Yu Chen,Zhou Yang,Shubo Wang,Xiaofeng Zheng,Yihui Wu,Ningyi Yuan,Wen‐Hua Zhang,Shengzhong Liu
标识
DOI:10.1002/adma.201805660
摘要
The unstable feature of the widely employed organic hole-transporting materials (HTMs) (e.g., spiro-MeOTAD) significantly limits the practical application of perovskite solar cells (PSCs). Therefore, it is desirable to design new structured PSCs with stable HTMs presenting excellent carrier extraction and transfer properties. This work demonstrates a new inverted PSC configuration. The new PSC has a graded band alignment and bilayered inorganic HTMs (i.e., compact NiOx and mesoporous CuGaO2 ). In comparison with planar-structured PSCs, the mesoporous CuGaO2 can effectively extract holes from perovskite due to the increased contact area of the perovskite/HTM. The graded energy alignment constructed in the ultrathin compact NiOx , mesoporous CuGaO2 , and perovskite can facilitate carrier transfer and depress charge recombination. As a result, the champion device based on the newly designed mesoscopic PSCs yields a stabilized efficiency of ≈20%, which is considered one of the best results for inverted PSCs with inorganic HTMs. Additionally, the unencapsulated PSC device retains more than 80% of its original efficiency when subjected to thermal aging at 85 °C for 1000 h in a nitrogen atmosphere, thus demonstrating superior thermal stability of the device. This study may pave a new avenue to rational design of highly efficient and stable PSCs.
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