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Optoelectronic Properties and the Stability of Mixed MA 1 − x IA x PbI 3 Perovskites
Author(s) -
Vega Erika,
Mollar Miguel,
Marí Bernabé
Publication year - 2020
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900743
Subject(s) - perovskite (structure) , crystallinity , ionic radius , energy conversion efficiency , materials science , crystal structure , crystallography , chemical engineering , chemistry , ion , optoelectronics , organic chemistry , engineering
The current state‐of‐the‐art perovskite solar cell (PSC) reaches a certified power conversion efficiency of 24.2%. However, one of the main drawbacks of PSCs is their stability. The use of compositional engineering based on the combinations of anions and cations of the perovskite structure gives good results in terms of efficiency and stability. Guanidinium (GA) is successfully investigated as an additive in the MAPbI 3 perovskite, improving structure, performance, and midterm stability. Similarly, among the cations that can form a 3D perovskite structure, imidazolium (IA) shows a large and favorable ionic radius (258 pm), in the upper limit of the tolerance factor. Herein, the stability and performance of perovskite‐based solar cells is studied when the methylammonium (MA) cation is gradually replaced with an IA cation in the precursor solution. Mixed MA/IA perovskites (MA 1 − x IA x PbI 3 ) are characterized by studying the effects of the IA incorporation on optoelectronic properties, film morphology, and crystal structure. X‐ray diffraction analyses establish the limit of solubility of IA at about 10%, and MA 1 − x IA x PbI 3 perovskites with an IA content of 6% show an improvement in crystallinity. Also, a study on the midterm stability of the mixed MA/IA perovskite is presented.