High‐Efficiency and UV‐Stable Planar Perovskite Solar Cells Using a Low‐Temperature, Solution‐Processed Electron‐Transport Layer,ChemSusChem

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High‐Efficiency and UV‐Stable Planar Perovskite Solar Cells Using a Low‐Temperature, Solution‐Processed Electron‐Transport Layer
ChemSusChem ( IF 7.5 ) Pub Date : 2018-03-08 , DOI: 10.1002/cssc.201702248
Cheng Liu ₁ , Yi Yang ₁ , Yong Ding ₁ , Jia Xu ₁ , Xiaolong Liu ₁ , Bing Zhang ₁ , Jianxi Yao ₁ , Tasawar Hayat ₂ , Ahmed Alsaedi ₂ , Songyuan Dai _{1,

2}

Affiliation

Efficient metal‐halide perovskite solar cells (PSCs) with a regular structure typically use high‐temperature‐processed TiO₂ electron‐transport layers (ETLs), which suffer from high electron recombination and inherent UV instability. Herein, we present low‐temperature solution‐processed lithium bis(trifluoromethanesulfonyl)imide (Li‐TFSI)‐doped C₆₀ (Li‐C₆₀) ETLs for high‐efficiency and UV‐stable planar PSCs with an n‐i‐p architecture. We found that simple Li‐TFSI doping ensured a better energy match between the active layer and the cathode, considerably enhanced the electron mobility of the ETL, and even improved CH₃NH₃PbI₃ crystallization finally to increase the power conversion efficiency (PCE) from 15.3 to 17.8 % with a minor hysteresis effect. Moreover, it was demonstrated that replacing TiO₂ with Li‐C₆₀ resulted in PSCs that were much more stable under UV light under an air atmosphere with almost no degradation after 3000 h under a nitrogen atmosphere.

中文翻译：

使用低温，固溶处理的电子传输层的高效且紫外线稳定的平面钙钛矿太阳能电池

具有规则结构的高效金属卤化物钙钛矿太阳能电池（PSC）通常使用经过高温处理的TiO ₂电子传输层（ETL），这些电子传输层高且固有的紫外线不稳定。在此，我们介绍了低温溶液处理的双（三氟甲烷磺酰基）酰亚胺锂（Li-TFSI）掺杂的C ₆₀（Li-C ₆₀）ETL，用于具有n-i-p架构的高效和紫外线稳定的平面PSC 。我们发现简单的Li-TFSI掺杂确保了活性层和阴极之间更好的能量匹配，大大提高了ETL的电子迁移率，甚至改善了CH ₃ NH ₃ PbI _3。最终结晶，以将功率转换效率（PCE）从15.3％提高到17.8％，并具有较小的磁滞效应。此外，已证明用Li-C ₆₀代替TiO ₂可使PSC在空气气氛下在紫外线下更稳定，而在氮气氛下3000 h后几乎没有降解。

更新日期：2018-03-08

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