Work

Effect of Alkali-Metal Additive on Rudorffite AgBiI4-Based Pb-Free Solar Cells

Year: 2025

Type: article

Abstract: Rudorffite material, silver bismuth iodide, is one of the promising lead-free alternatives for photovoltaic applications due to its high absorption coefficient, low toxicity, and relatively better stability. Here, we report on the effects of alkali halide additive in the absorber material AgBiI 4, focusing on its material properties and solar cell devices. The inclusion of NaI significantly improved the film quality with compact and pinhole-free morphology and better crystallinity. The device with rudorffite material with NaI additive demonstrated a notable increase in the PCE from 1.33 to 3.72%, along with improved device stability. The device analysis confirmed that NaI incorporation in AgBiI 4 modulates the optoelectronic quality, effectively suppressing charge recombination and enhancing charge extraction within the device. Thus, this work corroborates that additive engineering is an effective strategy for improving both the efficiency and stability of AgBiI 4 -based rudorffite solar cells, underscoring their potential in sustainable photovoltaic applications.

Source: ACS Applied Energy Materials

DOI: 10.1021/acsaem.5c00234

Authors: Shanas Fatima, Dhruba B. Khadka, Masatoshi Yanagida, Sunil Kumar Singh, Yasuhiro Shirai

Institutions: National Institute for Materials Science, Indian Institute of Technology BHU

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