Fundamental Chemical Research for Efficirnt Lead Free Perovskite Solar Cells

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H04699
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 36:Inorganic materials chemistry, energy-related chemistry, and related fields
• Research Institution: Kyoto University
• Principal Investigator: Wakamiya Atsushi 京都大学, 化学研究所, 教授 (60362224)
• Project Period (FY): 2021-04-05 – 2024-03-31
• Keywords: Snペロブスカイト / 太陽電池 / 双極子 / 界面修飾 / 有機半導体

Outline of Final Research Achievements

In this study, we worked on improving the performance of solar cells from the viewpoints of material chemistry and interface chemistry. We found that even perovskite semiconductors containing Sn exhibit a fluorescence lifetime exceeding 7 μs by means of material purification techniques and perovskite surface structure modification. In addition, we developed a method to structurally modify the upper and lower interfaces of the perovskite layers so that they express dipoles favorable for charge extraction. As a result, a high open-circuit voltage approaching the SQ theoretical limit was achieved, and a photoelectric conversion efficiency of 23.6%, the world's highest value for a Sn-containing solar cell, was obtained. In addition, PATAT with controlled molecular orientation on the ITO substrate was developed as an original hole-collecting monolayer material, and it was demonstrated that the photoelectric conversion efficiency and durability of the solar cell can be improved.

Free Research Field

材料化学

Academic Significance and Societal Importance of the Research Achievements

ペロブスカイト太陽電池はフレキシブル・軽量で発電効率が高い次世代太陽電池として注目を集めているが、その実用化に向けて、材料に用いるPbの代替技術開発が強く求められている。本研究では、Snを含むペロブスカイト半導体の高性能化に向けて、材料化学の観点から取り組んだ。本研究で得られた成果は、Snを用いたペロブスカイト太陽電池の高性能化に道を拓くものであり、本太陽電池の広範な用途での実用化に向けても、大きなインパクトを与えるものである。