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Updated: Jun 29, 2025
11:38
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
18.5K
Minimizing Voltage Losses via Synergistically Reducing Hetero-Interface Energy Offset for High Efficiency Perovskite
Xinxin Wang1, Hao Huang1, Min Wang1
1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of New Energy, North China Electric Power University, Beijing, 102206, China.
Small (Weinheim an Der Bergstrasse, Germany)
|April 2, 2024
Summary
Researchers reduced energy losses in perovskite solar cells (PSCs) by engineering interfaces. This strategy enhances power conversion efficiency (PCE) and open-circuit voltage (VOC), leading to more stable and efficient solar energy conversion.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- Open circuit voltage (VOC) losses at interfaces in perovskite solar cells (PSCs) hinder power conversion efficiency (PCE) improvements.
- Defects at the perovskite/electron transport layer (ETL) interface and passivation effects at the perovskite/hole transport layer (HTL) interface contribute to energy losses.
Purpose of the Study:
- To reduce energy offsets at hetero-interfaces within PSCs to mitigate VOC losses.
- To enhance the PCE and stability of PSCs through interface engineering.
Main Methods:
- Utilized pyromellitic acid as a molecular bridge at the perovskite/ETL interface to reduce defects and energy level offset.
- Incorporated (2-(4-(bis(4-methoxyphenyl)amino)phenyl)-1-cyanovinyl)phosphonic acid at the perovskite/HTL interface to neutralize passivation effects and optimize energy level alignment.
- Synergistically reduced hetero-interface energy offset through tailored molecular strategies.
Main Results:
- Achieved a power conversion efficiency (PCE) of 25.13% in PSCs.
- Increased the open-circuit voltage (VOC) from 1.134 V to 1.174 V.
- Demonstrated enhanced stability: unencapsulated PSCs retained ≈96% of initial PCE after 2000 hours of ambient aging and ≈97% after 210 hours of operational aging.
Conclusions:
- Tailored interface engineering effectively reduces energy offsets and VOC losses in PSCs.
- The developed strategy significantly boosts PCE and improves operational and ambient stability.
- This approach offers a promising pathway for advancing high-performance and durable perovskite solar cell technology.
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