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Guanidinium Passivation for Air‐Stable Rubidium‐Incorporated Cs(1 − x)RbxPbI2Br Inorganic Perovskite Solar Cells
Solar RRL ( IF 6.0 ) Pub Date : 2020-04-02 , DOI: 10.1002/solr.202000112
Weihai Zhang 1 , Juan Xiong 2 , Jinhua Li 3 , Walid A. Daoud 1
Affiliation  

Inorganic CsPbI2Br perovskite has gained growing attention due to its potential for improving device performance and stability. However, the notorious phase transition from the photoactive to photoinctive phase in ambient atmosphere hinders its further development. Herein, air‐stable rubidium (Rb)‐incorporated Cs(1 − x)RbxPbI2Br perovskite with guanidinium bromide (GABr) post‐treatment is demonstrated. The incorporation of smaller monovalent Rb cation contributes to a contraction of the perovskite crystal, leading to an improvement in structure stability. In addition, GABr modification induces a 2D/3D heterostructure perovskite with high crystallinity, appropriate surface morphology, favorable electronic properties, and significantly reduced trap‐state density. Consequently, the fabricated perovskite solar cells deliver a power conversion efficiency (PCE) of 15.6%, which is much higher than the 12.9% reported for reference CsPbI2Br‐based devices. Meanwhile, the significantly enhanced long‐term (88% of initial PCE after 60 days), thermal (76% of initial PCE after 30 days) as well as light soaking (90% of initial PCE after 300 min) stability in ambient atmosphere is demonstrated.

中文翻译:

空气稳定的掺C Cs(1-x)RbxPbI2Br无机钙钛矿太阳能电池的胍基钝化

无机CsPbI 2 Br钙钛矿因其改善器件性能和稳定性的潜力而受到越来越多的关注。然而,臭名昭著的在环境大气中从光活化相到光吸收相的转变阻碍了它的进一步发展。在此,掺入空气稳定的((Rb)的Cs 1-  x Rb x PbI 2证明了钙钛矿与溴化胍(GABr)的后处理。较小的一价Rb阳离子的引入有助于钙钛矿晶体的收缩,从而导致结构稳定性的改善。此外,GABr修饰可诱导2D / 3D钙钛矿异质结构,具有高结晶度,适当的表面形态,良好的电子性能以及显着降低的陷阱态密度。因此,所制造的钙钛矿太阳能电池可提供15.6%的功率转换效率(PCE),远高于报道的参考CsPbI 2的12.9%。基于Br的设备。同时,在环境大气中的长期稳定性(60天后初始PCE的88%),热(30天后初始PCE的76%)以及轻度浸泡(300分钟后初始PCE的90%)的稳定性显着提高。演示。
更新日期:2020-04-02
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