Intermixing-seeded growth for high-performance planar heterojunction perovskite solar cells assisted by precursor-capped nanoparticles. Issue 4 (19th January 2016)

• Record Type: Journal Article
• Authors: Li, Shao-Sian; Chang, Chi-Huang; Wang, Ying-Chiao; Lin, Chung-Wei; Wang, Di-Yan; Lin, Jou-Chun; Chen, Chia-Chun; Sheu, Hwo-Shuenn; Chia, Hao-Chung; Wu, Wei-Ru; Jeng, U-Ser; Liang, Chi-Te; Sankar, Raman; Chou, Fang-Cheng; Chen, Chun-Wei
• Is Part Of: Energy & environmental science. Volume 9:Issue 4(2016)
• Page Start: 1282
• Page End: 1289
• Publication Date: 2016-01-19
• Subjects: Energy conversion -- Periodicals; Fuel switching -- Periodicals; Environmental sciences -- Periodicals; Environmental chemistry -- Periodicals; 333.79
• DOI: 10.1039/c5ee03229f
• Languages: English
• ISSNs: 1754-5692

Abstract

Abstract : A novel approach to modulate the nucleation and growth of perovskite crystals by intermixing precursor-capped nanoparticles has been reported. Abstract : This work proposes a novel approach to modulate the nucleation and growth of perovskite crystals in planar perovskite (CH3 NH3 PbI3− x Cl x ) solar cells by intermixing precursor-capped inorganic nanoparticles of PbS. A small amount of dispersed PbS nanoparticles which were covered with perovskite precursor molecules of methylammonium iodide (CH3 NH3 I, MAI) through the ligand-exchange treatment functioned as effective seed-like nucleation sites to promote the formation of perovskite lattice structures. Through this intermixing-seeded growth technique, substantial morphological improvements, such as increased crystal domains, enhanced coverage, and uniformity, were realized in the perovskite thin films, and the corresponding solar cell devices exhibited a promising power conversion efficiency of 17.4%, showing an enhancement of approximately 25% compared to that of the controlled pristine solar cell device. The substantially enhanced crystal orientation, particularly along the direction perpendicular to the substrate, was evident from the synchrotron-based grazing incidence wide-angle X-ray scattering data. This observation was consistent with the enhanced carrier diffusion lengths and excellent reproducibility of high fill factors of the planar heterojunction perovskite devices fabricated through the proposed technique.