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23.81%-Efficiency Flexible Inverted Perovskite Solar Cells with Enhanced Stability and Flexibility via a Lewis Base
Jiwen Chen1, Xi Fan1, Jinzhao Wang2
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
ACS Nano
|July 11, 2024
Summary
Tri(o-tolyl)phosphine (TTP) enhances flexible perovskite solar cells (PSCs) by improving interface contact, perovskite quality, and energy level alignment. This results in high efficiency and stability for next-generation solar technology.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Flexible perovskite solar cells (PSCs) offer promising applications due to their lightweight and adaptable nature.
- Interface and grain boundary defects in PSCs often limit their power conversion efficiency (PCE) and long-term stability.
- Lewis base molecules can passivate undercoordinated lead atoms, potentially improving PSC performance.
Purpose of the Study:
- To enhance the efficiency, stability, and mechanical flexibility of flexible PSCs.
- To investigate the role of tri(o-tolyl)phosphine (TTP) as a Lewis base for interface passivation in PSCs.
- To achieve high power conversion efficiency (PCE) in flexible inverted PSCs.
Main Methods:
- Interface passivation of perovskite thin layers using tri(o-tolyl)phosphine (TTP).
- Fabrication of flexible inverted perovskite solar cells (PSCs).
- Characterization of perovskite film quality (crystallinity, defects, morphology) and device performance (PCE, stability).
Main Results:
- TTP treatment led to intimate interface contact and complete perovskite deposition on hole transport layers (HTLs).
- Optimized perovskite films exhibited enhanced crystallinity, reduced defects, and improved morphology (uniformity, low roughness).
- The flexible inverted PSCs achieved a high PCE of 23.81% with superior storage and operational stability, alongside enhanced mechanical flexibility.
Conclusions:
- Interface passivation with TTP is an effective strategy to boost the performance of flexible PSCs.
- TTP treatment significantly improves perovskite film quality and energy level alignment, leading to higher PCE.
- This method offers a pathway to highly efficient, stable, and mechanically robust flexible perovskite photovoltaics.
