Development of novel solar-cell materials based on perovskite-type sulfides

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14752
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: The University of Tokyo
• Principal Investigator: Nagai Takayuki 東京大学, 大学院工学系研究科(工学部), 特任助教 (30851018)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: ペロブスカイト型構造 / 太陽電池 / 化学ドーピング / 硫化物 / キャリア制御

Outline of Final Research Achievements

In this research, the carrier transport properties of perovskite-type sulfide BaZrS3, which is a promising candidate for solar cell material, have been investigated for chemical doped samples. The La-doped sample obtained by annealing the oxide-precursor in carbon disulfide (CS2) exhibits n-type semiconducting behavior. Conversely, the P-doped sample synthesized by the solid-state reaction method using sulfide- and phosphide-precursors exhibits the p-type semiconducting behavior. These findings represent first observations of p-type and n-type conduction in chemically doped BaZrS3. Furthermore, we successfully control the carrier concentrations in BaZrS3 by tuning the dopant concentrations. The present findings pave the way for the application of BaZrS3 in solar cell devices.

Free Research Field

固体化学

Academic Significance and Societal Importance of the Research Achievements

ペロブスカイト型硫化物BaZrS3は太陽電池材料として理想的な巨大な吸収係数と、高い化学的耐久性と環境親和性を併せ持つことから注目を集めており、本研究によって化学修飾によるp型、n型半導体化が実現し、キャリア輸送特性が明らかになったことは本物質の太陽電池応用に向けて意義をもつ。本物質は熱電材料としても有望視されており、本研究をきっかけにBaZrS3が太陽電池材料としてだけでなく、熱電材料も含めた広くエネルギー変換材料として研究が進展することが期待される。