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A Self-Assembled 3D/0D Quasi-Core-Shell Structure as Internal Encapsulation Layer for Stable and Efficient FAPbI3
Yuqi Wang1, Chao Yang2, Zhen Wang1
1Institute for Advanced Materials & Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 22, 2023
Summary
This study enhances Formamidinium Lead Iodide (FAPbI3) perovskite stability using a dual strategy, improving moisture resistance and device efficiency for solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- Formamidinium Lead Iodide (FAPbI3) perovskites offer high efficiency and thermal stability.
- Phase instability and moisture sensitivity hinder the long-term performance of FAPbI3-based devices.
Purpose of the Study:
- To address the phase instability and moisture sensitivity of FAPbI3 perovskite films.
- To enhance the operational stability and efficiency of FAPbI3 perovskite solar cells.
Main Methods:
- A dual strategy involving a self-assembled 3D/0D quasi-core-shell structure as an internal encapsulation layer.
- In situ introduction of excess lead iodide (PbI2) to passivate surface and grain boundary defects.
Main Results:
- The dual strategy effectively prevents moisture intrusion and passivates defects in FAPbI3 films.
- Achieved a champion device efficiency of 23.23% with minimized non-radiative recombination.
- Demonstrated enhanced moisture resistance with a T80 lifetime exceeding 3500 hours at 40% RH.
- A mini-module (5x5 cm2) achieved a power conversion efficiency (PCE) of 19.51%.
Conclusions:
- The developed method significantly improves the stability and efficiency of FAPbI3 perovskite solar cells.
- The findings provide valuable insights for advancing stable and high-performance perovskite solar cell technology.
