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A Multifunctional Dye Molecule as the Interfacial Layer for Perovskite Solar Cells
Jianlin Chen1, Xianfu Zhang1, Xuepeng Liu1
1Beijing Key Laboratory of Novel Thin-Film Solar Cells, School of New Energy, North China Electric Power University, Beijing 102206, China.
ACS Applied Materials & Interfaces
|April 19, 2024
Summary
A new dye molecule, ThPCyAc, enhances perovskite solar cell (PSC) performance by reducing defects and improving charge transfer. This leads to a higher power conversion efficiency (PCE) of 23.16% in PSC devices.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) face challenges with interface defects and energy level mismatches, hindering device performance and stability.
- Improving the perovskite/hole-transporting material (HTM) interface is crucial for efficient and stable PSCs.
Purpose of the Study:
- To design and synthesize a multifunctional dye molecule, ThPCyAc, for the perovskite/HTM interface.
- To investigate the impact of ThPCyAc on reducing defects, suppressing nonradiative recombination, and optimizing energy levels for enhanced charge extraction and transmission.
Main Methods:
- Synthesis of the multifunctional dye molecule ThPCyAc.
- Introduction of ThPCyAc at the perovskite/HTM interface in PSCs.
- Device performance characterization, including open-circuit voltage, fill factor, and power conversion efficiency (PCE).
Main Results:
- ThPCyAc effectively reduces defect density and nonradiative recombination through Lewis base interactions.
- Stepwise energy-level alignment facilitated by ThPCyAc improves charge extraction and transmission, reducing carrier accumulation.
- PSCs incorporating ThPCyAc achieved a maximum PCE of 23.16%, significantly outperforming the control device (21.49%).
- ThPCyAc also showed promising results as a self-assembled layer in inverted PSC devices.
Conclusions:
- Multifunctional dye molecules like ThPCyAc are effective for improving perovskite/HTM interfaces in PSCs.
- ThPCyAc enhances device efficiency and stability by addressing interface defects and energy level alignment.
- Dye molecules hold significant potential as interface materials for developing next-generation, high-performance perovskite solar cells.
