二维钙钛矿太阳能电池光电流成像研究

Photocurrent Mapping of Two-Dimensional Perovskite Solar Cell

深入了解钙钛矿太阳能电池中微纳空间形貌特征、光电特性与光伏参数之间的关系,对于指导高效钙钛矿太阳能电池器件的构建至关重要。本文通过将时间分辨共聚焦荧光显微镜与光电流检测模块相结合,实现了二维(2D)层状钙钛矿太阳能电池在实际工作条件下微纳空间的光电流、荧光强度和荧光寿命成像检测。发现在钙钛矿多晶膜中同一个晶粒的不同区域,光电流与荧光强度和荧光寿命成像之间存在明显的负相关性,在微纳空间尺度上建立了光伏参数与材料光电性质和形貌之间的相互关联,为钙钛矿太阳能电池的性能优化提供了理论指导。

Developing an interplay between the local morphological character,optoelectronic properties and its local photovoltaic parameters in a perovskite thin film is essential for guiding the construction of highly-efficient perovskite solar cells(PSC).In this work,by using a laserscanned and time-resolved confocal microscopy coupled with a picoammeter detection module,we realize in-situ photoluminescence(PL)intensity,PL lifetime,and photocurrent mappings in a two-dimensional(2D)PSC.A significant negative correlation is found between photocurrent and PL intensity and PL lifetime imaging within grains of the perovskite polycrystalline film.We establish the correlation between local photovoltaic parameters,optoelectronic properties,and morphology character,which provides theoretical guidance for the optimization of PSC performance.