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Reduced Self-Doping of Perovskites Induced by Short Annealing for Efficient Solar Modules
Joule ( IF 38.6 ) Pub Date : 2020-07-29 , DOI: 10.1016/j.joule.2020.07.003
Yehao Deng , Zhenyi Ni , Axel F. Palmstrom , Jingjing Zhao , Shuang Xu , Charles H. Van Brackle , Xun Xiao , Kai Zhu , Jinsong Huang

Controlling of doping in semiconducting light absorber can minimize the charge recombination and maximizing power output from solar cells; however, it is challenging for perovskites due to lack of controlled doping. Here, we report that a short post-annealing of less than 3 min for facilitating high-throughput manufacturing of perovskite solar modules in an ambient environment maintains the stoichiometric composition of perovskites, encouraging a spontaneous de-doping of perovskites during aging. The reduced self-doping results in less charge recombination and, thus, higher device efficiency. The stabilized open-circuit voltage of sub-cells in the CH3NH3PbI3 minimodules with an area >20 cm2 reaches 1.19 V on average. The aperture efficiency reaches 17.8% under one sun and 18.7% under a quarter sun illumination, deriving an averaged efficiency >20.0% for each sub-cell with an area >3 cm2, demonstrating the excellent uniformity of the films by this scalable process. The minimodule also works as uniform light-emitting devices.



中文翻译:

短退火对高效太阳能电池组件减少的钙钛矿自掺杂

控制半导体光吸收剂中的掺杂可以最大程度地减少电荷复合,并使太阳能电池的输出功率最大化;然而,由于缺乏受控的掺杂,钙钛矿具有挑战性。在这里,我们报告说,为了便于在环境中高通量生产钙钛矿太阳能电池组件,短短的退火后不到3分钟即可保持钙钛矿的化学计量组成,从而促进了钙钛矿在老化过程中的自发去掺杂。减少的自掺杂导致较少的电荷复合,从而提高了器件效率。CH 3 NH 3 PbI 3微型模块中面积> 20 cm 2的子电池的稳定开路电压平均达到1.19V。在一个太阳光下,孔径效率达到17.8%,在四分之一太阳光下,孔径效率达到18.7%,得出面积大于3 cm 2的每个子电池的平均效率> 20.0%,这表明该可伸缩工艺的薄膜具有出色的均匀性。微型模块还可以用作均匀的发光设备。

更新日期:2020-09-16
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