Developing novel p-type BiOX oxyhalides thin layer for stable and efficient CsPbI3 perovskite solar cells

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K15385
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 36020:Energy-related chemistry
• Research Institution: Toin University of Yokohama
• Principal Investigator: Guo Zhanglin 桐蔭横浜大学, 工学研究科, 特任助教 (40869559)
• Project Period (FY): 2020-04-01 – 2022-03-31
• Keywords: ペロブスカイト太陽電池 / 全無機ペロブスカイト / 高電圧

Outline of Final Research Achievements

CsPbX3 (X=I, Br) perovskite solar cells (PSCs) have potential applications in tandem solar cells and indoor photovoltaics. While the low efficiency and poor stability are limiting their perspectives. This project is aiming at developing efficient and stable CsPbX3 PSCs and the following results were achieved.
Firstly, charge transport materials of amorphous SnOx and dopant-free polymer PDTDT were developed, by which the high efficiency especially the high voltage, and good stability of CsPbX3 PSCs were realized. These materials can be used in other research on CsPbX3 PSCs. Secondly, the CsPbX3 perovskite defects (undercoordinated Pb2+ and metallic Pb) were well suppressed by a molecule surface passivation method, promoting the voltage of solar cells to over 92% of the theoretical limit. In summary, these researches solved the problem of the low efficiency of CsPbX3 PSCs by increasing the voltage. The stability of CsPbX3 PSCs was also improved by using the dopant-free PDTDT.

Free Research Field

ペロブスカイト太陽電池

Academic Significance and Societal Importance of the Research Achievements

この研究は、CsPbX3太陽電池の電圧損失と不安定性の問題を解決しました。 その結果、タンデム太陽電池や屋内太陽光発電への応用がより有望になります。
トップセルとしてCsPbX3を使用すると、タンデム太陽電池で2 Vを超える高電圧と30％を超える効率が達成され、Siパネルよりも効率的な太陽電池を提供できます。 十分な電力と駆動電圧を提供するCsPbX3屋内太陽電池を使用することで、セルフパワーのIoTシステムを実現できます。