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Role of Residual PbI2 in Two-step Vapor Processed Perovskite Solar Cells with Methylamine Treatment

Year: 2025

Type: conference-paper

Abstract: Methylamine (MA) treatment of vapor-processed perovskite films is used to improve performance of perovskite solar cells (PSC) by a significant increase in open-circuit voltage. In sequential processing of PSCs, the presence of residual PbI2in the film impacts device performance. This study aims to understand the role of residual PbI2after MA treatment and its effect on PSCs. We characterize properties of MA-treated PbI2films and MA-treated perovskite films with different amounts of PbI2from two-step vapor processing. Our findings suggest that MA interacts with PbI2and changes its optical properties. However, the role of excess PbI2in MA-treated and as-deposited PSCs does not change, with Voc improvement after MA treatment depending on the amount of PbI2in the as-deposited film. An optimized MA-treatment gives approximately a 10% increase in VOCcompared to untreated PSC devices.

Source: Conference record of the IEEE Photovoltaic Specialists Conference

DOI: 10.1109/pvsc59419.2025.11132659

Authors: Chaiwarut Santiwipharat, Austin G. Kuba, Kevin D. Dobson, Ujjwal K. Das, William N. Shafarman

Institution: University of Delaware

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: green

OpenAlex ID: W4413822658

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