Whether Addition of Phenethylammonium Ion is Always Beneficial to Stability Enhancement of MAPbI3 Perovskite Film?. Issue 14 (1st June 2020)

• Record Type: Journal Article
• Authors: Lei, Nuo; Pan, Lu; Ye, Tao; Chen, Shuang; Wang, Xi
• Is Part Of: Advanced materials interfaces. Volume 7:Issue 14(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-01
• Subjects: 2D/3D perovskites -- crystal failure -- solar cells -- stability; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202000197
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: The recent studies widely believe that the stability of (PEA)2 PbI4 /MAPbI3 perovskite solar cells (PSCs) can be progressively increased with the addition of phenethylammonium ion (PEA + ). Herein, it is reported on the stability variations after the addition of PEA + into the MAPbI3 film and it is demonstrated that excess PEA + has negative effect on the stability of (PEA)2 PbI4 /MAPbI3 perovskite film. X‐ray photoelectron spectroscopy, nuclear magnetic resonance, and X‐ray absorption fine structure spectroscopy are utilized to testify that the excess PEA + damages the MAPbI3 crystal structure and generates defects due to the strong coordination between NH3 + from PEA + and I − from [PbI6 ] 4− . This work reveals that the stability of (PEA)2 PbI4 /MAPbI3 perovskite films is not proportional to the addition of PEA +, which is of interest for the developing of stable 2D/3D PSCs. Abstract : The 2D/3D perovskite film shows excellent stability in the ambient‐air condition and thermal condition, but its stability does not increase with the adding of (PEA)2 PbI4 perovskites. Comparing different concentrations of 2D/3D perovskite solutions, it is found that at high concentrations the PEA + can damage the crystal structure of 3D grain, which leads to accelerate its degradation and reduces its stability.