Controlled crystal facet of MAPbI3 perovskite for highly efficient and stable solar cell via nucleation modulation. Issue 1 (7th December 2018)

• Record Type: Journal Article
• Authors: Ma, Yongchao; Hangoma, Pesi Mwitumwa; Park, Woon Ik; Lim, Jae-Hong; Jung, Yun Kyung; Jeong, Jung Hyun; Park, Sung Heum; Kim, Kwang Ho
• Is Part Of: Nanoscale. Volume 11:Issue 1(2019)
• Page Start: 170
• Page End: 177
• Publication Date: 2018-12-07
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr08344d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The crystal facet of MAPbI3 perovskite is purposefully controlled to achieve highly efficient and stable solar cells via nucleation modulation. Abstract : The crystallization of MAPbI3 perovskite films was purposefully engineered to investigate the governing factors which determine their morphological properties and moisture stability. By modulating nucleation, we obtained a single layer perovskite film with controlled crystal facet orientation and grain size. The lack of perovskite nucleation sites during crystallization allowed us to tailor the resulting crystallization phase. Theoretical calculations indicated that the nucleation sites for perovskite growth are related to the electron density around the oxygen atom (CO and SO) in a Lewis base. A single layer of micrometer-sized and (110)-oriented perovskite crystals was achieved in the optimized MAPbI3 films via suppressing the formation of nucleation sites. We fabricated inverted perovskite solar cells with the structure of glass/ITO/PEDOT:PSS/MAPbI3 /PC61 BM/Al which exhibited a high power conversion efficiency of 17.5% and a high fill factor over 83%. In addition, a study of the moisture stability indicated that the (110) facet orientation of the perovskite grains plays a more important role in film degradation than grain size.