Triphenylamine–Polystyrene Blends for Perovskite Solar Cells with Simultaneous Energy Loss Suppression and Stability Improvement,Solar RRL

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Triphenylamine–Polystyrene Blends for Perovskite Solar Cells with Simultaneous Energy Loss Suppression and Stability Improvement
Solar RRL ( IF 6.0 ) Pub Date : 2020-09-22 , DOI: 10.1002/solr.202000490
Junhui Ran ₁ , Pan Yuan ₂ , HaiPeng Xie ₂ , Fang Wan ₂ , Yifu Chen ₂ , Yongbo Yuan ₂ , Mai He _{3,

4} , Jia Li ₁ , Xiao Wang _{3,

4} , Anlian Pan _{1,

4} , Yongli Gao ₅ , Bin Yang _{1,

4}

Affiliation

Energy loss induced by nonradiative recombinations plays a critical role in determining power conversion efficiencies in perovskite solar cells, whereas device stability impacts their long‐time reliability in the ambient environment. It is an important challenge to suppress energy loss and improve device stability simultaneously. Herein, an interfacial layer of triphenylamine (TPA):polystyrene (PS) blend coated on the hybrid perovskite layer to concurrently suppress energy loss and improve device stability is reported. The energy loss is suppressed from 0.49 to 0.35 eV by passivating surface defects in hybrid perovskites via Lewis acid–base interactions with the combination of electron‐donating aromatic nucleus in PS and tertiary amine in TPA, leading to perovskite solar cells with a high open‐circuit voltage of 1.18 V, a fill factor of about 80%, and a power conversion efficiency of 22.1%. Meanwhile, the device stability in the ambient environment is improved significantly by the TPA:PS blend due to its superior hydrophobicity which is suggested by its high contact angle of 91.1° as compared to 64.0° for the pristine perovskite film. Herein, an efficient interfacial engineering approach with the TPA:PS blend to suppress energy loss and improve device stability simultaneously towards realistic applications is demonstrated.

中文翻译：

钙钛矿型太阳能电池用三苯胺-聚苯乙烯共混物，同时抑制了能量损失并提高了稳定性

非辐射复合引起的能量损失在确定钙钛矿太阳能电池的功率转换效率中起着至关重要的作用，而器件的稳定性会影响其在周围环境中的长期可靠性。抑制能量损失并同时提高器件稳定性是一项重要的挑战。本文中，报道了涂覆在杂化钙钛矿层上以同时抑制能量损失并改善器件稳定性的三苯胺（TPA）：聚苯乙烯（PS）共混物的界面层。通过路易斯酸碱相互作用，PS中给电子的芳族核和TPA中叔胺的结合钝化杂化钙钛矿中的表面缺陷，可将能量损失从0.49 eV抑制到0.35 eV，从而导致钙钛矿型太阳能电池具有高开放度。电路电压为1.18 V，填充系数约为80％，功率转换效率为22.1％。同时，TPA：PS共混物由于其优越的疏水性而在周围环境中的设备稳定性得到了显着改善，这与原始钙钛矿薄膜的64.0°相比具有91.1°的高接触角表明。在本文中，展示了一种有效的界面工程方法，使用TPA：PS共混物可抑制能量损失并同时提高器件的稳定性，以适应实际应用。

更新日期：2020-09-22

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