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Efficient p-n Heterojunction Perovskite Solar Cell without a Redundant Electron Transport Layer and Interface
Like Huang1, Jiahao Wang1, Yuejin Zhu1,2
1Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo, Zhejiang 315211, China.
The Journal of Physical Chemistry Letters
|March 1, 2021
Summary
This study presents an efficient perovskite solar cell (PSC) without an electron transport layer or interface engineering. Simplified fabrication and a wide processing window offer great potential for scalable perovskite solar cell applications.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) are promising renewable energy devices.
- Electron transport layers and interface engineering are common but add complexity.
- Optimizing interfaces is crucial for efficient charge extraction and device performance.
Purpose of the Study:
- To develop an electron transport layer-free PSC without interface engineering.
- To investigate a novel p-n heterojunction for simplified PSC fabrication.
- To enhance energy level alignment at the ITO/perovskite interface for improved performance.
Main Methods:
- Fabrication of a p-n heterojunction using ITO/n-type FA0.9Cs0.1PbI3-Cl/p-type spiro-MeOTAD/Ag.
- Utilizing a self-seeding growth method to tune perovskite film properties.
- Employing double-side photoluminescence (PL) and reduced PL measurements for interface analysis.
Main Results:
- Achieved naturally matched energy levels between FA0.9Cs0.1PbI3-Cl and ITO, eliminating the need for interface engineering.
- Demonstrated enhanced ITO/perovskite interface energy level alignment.
- Obtained a device efficiency of 17.48% with an open-circuit voltage (Voc) of 1.02 V.
- FA0.9Cs0.1PbI3-Cl film exhibits a wide antisolvent processing window, suitable for large-area production.
Conclusions:
- A simplified, efficient PSC architecture is demonstrated without electron transport layers or interface engineering.
- The self-seeding growth method effectively regulates film properties and improves device performance.
- The developed PSCs show significant potential for practical, large-scale applications due to their simplified fabrication and performance.
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