Outstanding Passivation Effect by a Mixed-Salt Interlayer with Internal Interactions in Perovskite Solar Cells,ACS Energy Letters

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Outstanding Passivation Effect by a Mixed-Salt Interlayer with Internal Interactions in Perovskite Solar Cells
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-09-14 , DOI: 10.1021/acsenergylett.0c01664
Bowen Yang ₁ , Jiajia Suo ₁ , Edoardo Mosconi ₂ , Damiano Ricciarelli _{2,

3} , Wolfgang Tress ₄ , Filippo De Angelis _{2,

3,

5} , Hui-Seon Kim ₆ , Anders Hagfeldt ₁

Affiliation

Nonradiative recombination is a major limiting factor in obtaining efficient metal-halide perovskite photovoltaics. Here, a passivation treatment is developed by applying a mixture of a new ammonium salt, CF₃(CF₂)₂CH₂NH₃I (HBAI), and a conventional formamidinium halide, FAX, on top of the 3D perovskite bulk film. The introduction of such an optimized passivation layer effectively suppressed charge recombination by passivating the surface traps of the 3D perovskite film, enabling a well-matched energy alignment at the interface of perovskite/HTM, leading to a high power conversion efficiency (PCE) of over 23% from current–voltage (I–V) measurements and a stabilized 22.7% PCE, owing to a substantial V_OC improvement (above 80 mV on average), coupled with an improved stability.

中文翻译：

在钙钛矿太阳能电池中具有内部相互作用的混合盐中间层的出色钝化效果

非辐射复合是获得有效的金属卤化物钙钛矿光伏材料的主要限制因素。在此，通过在3D钙钛矿块状膜的顶部施加新的铵盐CF ₃（CF ₂）₂ CH ₂ NH ₃ I（HBAI）和常规的甲form卤化物FAX的混合物来进行钝化处理。通过钝化3D钙钛矿膜的表面陷阱，引入了这种优化的钝化层可有效抑制电荷复合，从而使钙钛矿/ HTM界面处的能量匹配良好匹配，从而导致超过200瓦的高功率转换效率（PCE）电流电压的23％（I – V）测量和稳定的22.7％PCE，这归因于V _OC的大幅改善（平均超过80 mV）以及更高的稳定性。

更新日期：2020-10-11

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