Enhancing Electron Transport via Graphene Quantum Dot/Tin Oxide Composites for Efficient and Durable Flexible Perovskite Photovoltaics
Hong Lin a, Yu Zhou a
a State Key Laboratory of New Ceramics & Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, P. R. China.
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Hong Lin, 205
Publication date: 11th February 2019

Recent advances in flexible perovskite solar cells (PSCs) have attracted considerable attention owing to their great potential for bendable and wearable electronic devices. Particularly, developing high-quality low-temperature processed electron transport layers (ETLs) plays a pivotal role in realizing highly efficient flexible PSCs. Herein, we develop a facile strategy to fabricate graphene quantum dot/SnO2 composites (G@SnO2) as effective ETLs. Systematical optimization and investigation reveal that SnO2 blending with graphene quantum dots with ca. 5 nm in diameter (G5@SnO2) have higher electron mobility, better film coverage as well as greater energy level alignment compared to pristine SnO2, leading to promoted charge transfer and suppressed charge recombination. Based on G5@SnO2 ETL, PSCs exhibit a champion PCE of 19.6% for rigid substrate and 17.7 % for flexible substrate, respectively. Moreover, these flexible devices demonstrate outstanding durability, retaining 91% of their original PCE after 500 bending cycles. This work provides a facile route to develop effective ETLs for high-performance flexible PSCs and paves the way for further advances in flexible photovoltaic devices and optoelectronic applications.

We express much gratitude to the Sino-Italy International Cooperation on Innovation (2016YFE0104000), the National Natural Science Foundation of China (NSFC, 51772166), the Projects of International Cooperation and exchanges (NSFC, 51561145007) and the National Energy Novel Materials Center (NENMC-II-1705) for their financial support.

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