A Novel Anion Doping for Stable CsPbI2Br Perovskite Solar Cells with an Efficiency of 15.56% and an Open Circuit Voltage of 1.30 V. Issue 40 (18th September 2019)

• Record Type: Journal Article
• Authors: Zhao, Huan; Han, Yu; Xu, Zhuo; Duan, Chenyang; Yang, Shaomin; Yuan, Shihao; Yang, Zhou; Liu, Zhike; Liu, Shengzhong (Frank)
• Is Part Of: Advanced energy materials. Volume 9:Issue 40(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-09-18
• Subjects: anion doping -- CsPbI2Br -- high efficiency -- high open circuit voltage -- inorganic perovskite solar cells; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201902279
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: The Cs‐based inorganic perovskite solar cells (PSCs), such as CsPbI2 Br, have made a striking breakthrough with power conversion efficiency (PCE) over 16% and potential to be used as top cells for tandem devices. Herein, I − is partially replaced with the acetate anion (Ac − ) in the CsPbI2 Br framework, producing multiple benefits. The Ac − doping can change the morphology, electronic properties, and band structure of the host CsPbI2 Br film. The obtained CsPbI2− x Br(Ac) x perovskite films present lower trap densities, longer carrier lifetimes, and fast charge transportation compared to the host CsPbI2 Br films. Interestingly, the CsPbI2− x Br(Ac) x PSCs exhibit a maximum PCE of 15.56% and an ultrahigh open circuit voltage ( V oc ) of 1.30 V without sacrificing photocurrent. Notably, such a remarkable V oc is among the highest values of the previously reported CsPbI2 Br PSCs, while the PCE far exceeds all of them. In addition, the obtained CsPbI2− x Br(Ac) x PSCs exhibit high reproducibility and good stability. The stable CsPbI2− x Br(Ac) x PSCs with high V oc and PCE are desirable for tandem solar cell applications. Abstract : Herein, acetate anion (Ac − ) is used to partially replace I − in the CsPbI2 Br framework. Ac − doping changes the morphology, electronic properties, and band structure of the host CsPbI2 Br film. The obtained CsPbI2− x Br(Ac) x perovskite solar cells exhibit a power conversion efficiency of 15.56%, an open circuit voltage of 1.30 V, and great air stability.