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Over 19% Efficiency Perovskite Solar Modules by Simultaneously Suppressing Cation Deprotonation and Iodide Oxidation
Lei Wang1, Ting Zhang1, Shihao Yuan1
1School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China.
ACS Applied Materials & Interfaces
|January 19, 2024
Summary
Researchers developed a new method using l-ascorbic acid (l-AA) to stabilize perovskite solar cells (PSCs). This stabilizer prevents reactions at the nickel oxide/perovskite interface, boosting efficiency and stability for large-area solar modules.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) with nickel oxide (NiO) hole transport layers offer cost-effectiveness and scalability.
- Interfacial chemical reactions between NiO and perovskite layers, specifically cation deprotonation and iodide oxidation, limit device performance and stability.
- Existing strategies have not fully resolved these interfacial issues in PSCs.
Purpose of the Study:
- To develop an efficient strategy to suppress interfacial reactions in NiO/perovskite solar cells.
- To stabilize the precursor solution for improved perovskite film quality.
- To enhance the power conversion efficiency (PCE) and long-term stability of PSCs and large-area solar modules.
Main Methods:
- Incorporation of l-ascorbic acid (l-AA), a reducing and weakly acidic stabilizer, into the precursor solution.
- Utilizing l-AA to reduce generated iodine (I2) to iodide (I-) and inhibit cation deprotonation.
- Fabrication of inverted PSCs and large-area solar modules using slot-die coating with l-AA.
Main Results:
- Achieved a power conversion efficiency (PCE) of 22.72% for inverted PSCs with a high open-circuit voltage of 1.19 V.
- Demonstrated a remarkable PCE of 19.17% for large-area (>50 cm2) inverted perovskite solar modules fabricated via slot-die coating.
- l-AA acts as a barrier layer, preventing undesirable interfacial reactions and significantly enhancing device stability.
Conclusions:
- l-Ascorbic acid is an effective stabilizer for NiO/perovskite interfaces, simultaneously improving precursor solution stability and suppressing detrimental reactions.
- The strategy leads to highly efficient and stable inverted PSCs and large-area perovskite solar modules.
- This work provides crucial insights for advancing NiO/perovskite interface engineering and the development of efficient, low-cost, large-scale perovskite solar technologies.
