Regulating strain in perovskite thin films through charge-transport layers.

ABSTRACT: Thermally-induced tensile strain that remains in perovskite films following annealing results in increased ion migration and is a known factor in the instability of these materials. Previously-reported strain regulation methods for perovskite solar cells (PSCs) have utilized substrates with high thermal expansion coefficients that limits the processing temperature of perovskites and compromises power conversion efficiency. Here we compensate residual tensile strain by introducing an external compressive strain from the hole-transport layer. By using a hole-transport layer with high thermal expansion coefficient, we compensate the tensile strain in PSCs by elevating the processing temperature of hole-transport layer. We find that compressive strain increases the activation energy for ion mi

SUBMITTER: Xue DJ 

PROVIDER: S-EPMC7090003 | biostudies-literature | 2020 Mar

REPOSITORIES: biostudies-literature