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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Suppressed Intermolecular Interaction Between Organic Spacers for High-Performance p-i-n and n-i-p Perovskite Solar
Hao Yin1, Weiwei Meng1, Yuhan Guo1
1Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|July 9, 2025
Summary
Cyclohexylmethylammonium (CHMA+) reduces 2D phase formation in perovskite solar cells (PSCs), enhancing charge transport. This leads to improved efficiency and long-term stability for CHMA+-modified PSCs.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Ammonium cations are crucial for defect passivation in perovskite solar cells (PSCs).
- However, ammonium cations can form 2D phases, hindering charge transport in 3D perovskites.
Purpose of the Study:
- To investigate the impact of cyclohexylmethylammonium (CHMA+) on PSC performance.
- To compare CHMA+ with phenylethylammonium (PEA+) in modifying perovskite structures.
Main Methods:
- Introduction of CHMA+ as a low-polarity, low-rigidity alicyclic ammonium cation.
- Comparative analysis with PEA+, a cation exhibiting strong π-π interactions.
- Fabrication and testing of PSCs with p-i-n and n-i-p architectures.
Main Results:
- CHMA+ reduces intermolecular interactions and improves defect coordination.
- PEA+ facilitates quasi-2D phase formation, compromising charge extraction.
- CHMA+-modified PSCs achieved power conversion efficiencies of 25.66% (p-i-n) and 24.94% (n-i-p).
Conclusions:
- Rational design of ammonium spacers, like CHMA+, can significantly enhance PSC efficiency.
- CHMA+ modification leads to superior operational stability, maintaining over 95% efficiency after 1000 hours.
- CHMA+ offers a promising strategy for developing high-performance and stable perovskite solar cells.
