Stoichiometry-Controlled Cobalt Sulfide-Based Hole Transport Layers for Perovskite Solar Cells.

ABSTRACT: Most hole transport layers (HTLs) used in perovskite solar cells (PSCs) require extrinsic doping to enhance conductivity and modify energy levels. However, such doping often induces structural disorder, compositional inhomogeneity, and band edge distortion owing to dopant segregation, reducing hole mobility and interfacial charge trapping. Herein, Co_xS_y with controlled stoichiometry is reported as a dopant-free inorganic HTL. Three phase-pure compositions, namely, CoS, Co₄S₃, and Co₉S₈, are synthesized using a hot-injection method by controlling the injection temperature of a sulfur-oleylamine precursor. Each stoichiometrically defined Co_xS_y HTL possessed distinct valence band positions, enabling system

SUBMITTER: Koo B 

PROVIDER: S-EPMC12674109 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature