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Improving the Performance of Perovskite Solar Cells with Insulating Additive-Modified Hole Transport Layers
Guodong Zhang1,2, Yifan Zheng1,2, Yifeng Shi1
1Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
ACS Applied Materials & Interfaces
|February 22, 2022
Summary
Optimizing perovskite solar cells (PSCs) with insulating additives in the hole transport layer (HTL) improved power conversion efficiency (PCE) and device stability. This approach enhances PSC performance by improving perovskite film quality and energy alignment.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inverted perovskite solar cells (PSCs) offer flexibility and tandem potential.
- Current hole transport layer (HTL) optimization uses conductive additives, but these reduce device stability due to humidity sensitivity.
Purpose of the Study:
- To investigate the use of insulating additives for HTL optimization in PSCs.
- To enhance both the power conversion efficiency (PCE) and long-term stability of PSCs.
Main Methods:
- Incorporated insulating additives, specifically polyphenylene sulfide, into the HTL of inverted PSCs.
- Evaluated device performance (PCE) and stability under accelerated aging conditions (double 85).
Main Results:
- Achieved a PCE enhancement from 19.1% to 21.5% using insulating additives.
- Demonstrated improved device stability with a T50 lifetime of 574 hours under double 85 aging.
- Observed larger perovskite grain sizes and improved energy-level alignment between HTL and perovskite.
Conclusions:
- Insulating additives can successfully optimize HTLs in PSCs, counterintuitively improving performance.
- This strategy enhances PSC efficiency and stability by improving perovskite film morphology and energy alignment, compensating for reduced conductivity.
