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Published on: February 27, 2017
Multifunctional AO-245 Antioxidant Enables UV-Resistant and High-Efficient Perovskite Solar Cells.
Qionghua Su1, Dongqi Wu1, Huanyi Zhou2
1School of Chemistry and Chemical Engineering, Guangxi Key Laboratory of Electrochemical Energy Materials, State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Guangxi Colleges and Universities Key Laboratory of Applied Chemistry Technology and Resource Development, Guangxi University, Nanning, P. R. China.
This study introduces an antioxidant (AO-245) into perovskite solar cells (PSCs) to enhance UV stability. The AO-245 additive improves durability and efficiency, enabling PSCs for extreme environments.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) face stability issues under ultraviolet (UV) radiation, hindering their use in harsh conditions.
- UV exposure causes photodegradation, reducing the performance and lifespan of PSCs.
- Developing robust PSCs for extreme environments like deserts and plateaus is crucial for widespread adoption.
Purpose of the Study:
- To enhance the UV stability of perovskite solar cells (PSCs) using an antioxidant additive.
- To investigate the protective mechanisms of the antioxidant against UV-induced degradation.
- To improve the power conversion efficiency (PCE) and long-term durability of PSCs.
Main Methods:
- Incorporation of antioxidant [triethylene glycol bis (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] (AO-245) into the perovskite layer via the anti-solvent method.
- Evaluation of AO-245's UV absorption and radical scavenging properties (superoxide radicals).
- Assessment of device performance and stability under prolonged UV irradiation (275 nm and 365 nm).
Main Results:
- AO-245 effectively absorbs UV light and neutralizes superoxide radicals via hydrogen atom transfer (HAT).
- The -OH group in AO-245 forms hydrogen bonds with I⁻, inhibiting iodide ion migration and enhancing UV stability.
- AO-245-modified PSCs retained over 88% (275 nm) and 83% (365 nm) of their initial PCE after 120 hours of UV exposure.
- Passivation of uncoordinated Pb²⁺ by AO-245 improved film quality and device stability, achieving a PCE of 19.76% in HTM-free C-PSCs.
Conclusions:
- AO-245 significantly improves the UV stability and durability of perovskite solar cells.
- The antioxidant additive offers a straightforward method to protect PSCs from photodegradation, enabling their use in challenging environments.
- This work presents a promising strategy for developing highly stable and efficient PSCs for real-world applications.
