Guanidinium Passivation for Air-Stable Rubidium-Incorporated Cs(1 - x)RbxPbI2Br Inorganic Perovskite Solar Cells

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number2000112
Journal / PublicationSolar RRL
Issue number6
Online published2 Apr 2020
Publication statusPublished - Jun 2020


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.

Research Area(s)

  • air stable solar cells, inorganic perovskites, passivation, EFFICIENT, PERFORMANCE, STABILITY, CATIONS