Improving Two-Step Prepared CH₃NH₃PbI₃ Perovskite Solar Cells by Co-Doping Potassium Halide and Water in PbI₂ Layer.

ABSTRACT: Incorporating additives into organic halide perovskite solar cells is the typical approach to improve power conversion efficiency. In this paper, a methyl-ammonium lead iodide (CH₃NH₃PbI₃, MAPbI₃) organic perovskite film was fabricated using a two-step sequential process on top of the poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) hole-transporting layer. Experimentally, water and potassium halides (KCl, KBr, and KI) were incorporated into the PbI₂ precursor solution. With only 2 vol% water, the cell efficiency was effectively improved. Without water, the addition of all of the three potassium halides unanimously degraded the performance of the solar cells, although the crystallinity was improved. Co-doping with KI

SUBMITTER: Wu HT 

PROVIDER: S-EPMC6566305 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature