Europium and Acetate Co‐doping Strategy for Developing Stable and Efficient CsPbI2Br Perovskite Solar Cells. Issue 46 (8th October 2019)

• Record Type: Journal Article
• Authors: Yang, Shaomin; Zhao, Huan; Han, Yu; Duan, Chenyang; Liu, Zhike; Liu, Shengzhong (Frank)
• Is Part Of: Small. Volume 15:Issue 46(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-10-08
• Subjects: co‐doping -- CsPbI2Br perovskites -- Eu(Ac)3 -- high efficiency -- high stability; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201904387
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: All‐inorganic perovskite solar cells have developed rapidly in the last two years due to their excellent thermal and light stability. However, low efficiency and moisture instability limit their future commercial application. The mixed‐halide inorganic CsPbI2 Br perovskite with a suitable bandgap offers a good balance between phase stability and light harvesting. However, high defect density and low carrier lifetime in CsPbI2 Br perovskites limit the open‐circuit voltage ( V oc < 1.2 V), short‐circuit current density ( J sc < 15 mA cm −2 ), and fill factor (FF < 75%) of CsPbI2 Br perovskite solar cells, resulting in an efficiency below 14%. For the first time, a CsPbI2 Br perovskite is doped by Eu(Ac)3 to obtain a high‐quality inorganic perovskite film with a low defect density and long carrier lifetime. A high efficiency of 15.25% (average efficiency of 14.88%), a respectable V oc of 1.25 V, a reasonable J sc of 15.44 mA cm −2, and a high FF of 79.00% are realized for CsPbI2 Br solar cells. Moreover, the CsPbI2 Br solar cells with Eu(Ac)3 doping demonstrate excellent air stability and maintain more than 80% of their initial power conversion efficiency (PCE) values after aging in air (relative humidity: 35–40%) for 30 days. Abstract : CsPbI2 Br perovskite is doped by Eu(Ac)3 to obtain high‐quality perovskite films with low defect density and long carrier lifetime. A high efficiency of 15.25%, an open‐circuit voltage of 1.25 V, a short‐circuit current density of 15.44 mA cm −2, and a fill factor of 79.00% are realized for CsPbI2 Br solar cells. The devices with Eu(Ac)3 doping demonstrate excellent air stability.