卤化物
三辛基氧化膦
钙钛矿(结构)
串联
带隙
半导体
材料科学
纳米晶
光化学
化学
纳米技术
无机化学
光电子学
结晶学
萃取(化学)
复合材料
色谱法
作者
Rebecca A. Belisle,Kevin A. Bush,Luca Bertoluzzi,Aryeh Gold‐Parker,Michael F. Toney,Michael D. McGehee
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2018-10-05
卷期号:3 (11): 2694-2700
被引量:181
标识
DOI:10.1021/acsenergylett.8b01562
摘要
Photoinduced halide segregation currently limits the perovskite chemistries available for use in high-bandgap semiconductors needed for tandem solar cells. Here, we study the impact of post-deposition surface modifications on photoinduced halide segregation in methylammonium lead mixed-halide perovskites. By coating a perovskite surface with the electron-donating ligand trioctylphosphine oxide (TOPO), we are able to both reduce nonradiative recombination and dramatically slow the onset of halide segregation in CH3NH3PbI2Br films. This result, coupled with the observation that the rate of halide segregation can be tuned by varying the selective contact, provides a direct link between surface modifications and photoinduced trap formation. On the basis of these observations, we discuss possible mechanisms for photoinduced halide segregation supported by drift-diffusion simulations. This work suggests that improved understanding and control of perovskite surfaces provides a pathway toward stable and high-performance wide-bandgap perovskites for the next generation of tandem solar cells.
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