Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 17, Pages 20296-20304Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01685
Keywords
perovskite solar cells; azahomofullerene derivatives; electron-transporting layer; stability; hysteresis
Funding
- National Research Foundation of Korea (NRF) [NRF-2017R1A2B4008117]
- Priority Research Centers Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology [NRF-2018R1A6A1A03024334]
- Department of Science and Technology, India under DST-FIST
- University Grants Commission, India under DRS-SAP
- Department of Science and Technology (DST), Government of India
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Novel solution-processable azahomofullerene derivatives (AHF) serve as effective electron-transport layers in perovskite solar cells, achieving higher photovoltaic performances and improved device stability.
Fullerene derivatives with a strong electron-accepting ability play a crucial role in enhancing both the performance and stability of perovskite solar cells (PSCs). However, most of the used fullerene molecules are based on [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM), which limits the device performance due to difficulties in preparing high-quality and uniform thin films. Herein, solution-processable azahomofullerene (AHF) derivatives (abbreviated as AHF-1 and AHF-2) are reported as novel and effective electron-transport layers (ETLs) in p-i-n planar PSCs. Compared to the control PCBM ETL-based PSCs, the devices based on AHFs exhibit higher photovoltaic performances, which is attributed to the enhanced charge-transport properties and improved layer morphology leading to a maximum power conversion efficiency (PCE) of 20.21% in the case of the device based on AHF-2 ETL. Besides, due to the preferable energy band alignment with the perovskite layer, reduced trap states, and suppressed charge recombination, the device with AHF-2 ETL exhibits significantly suppressed hysteresis and improved stability under both ambient and thermal conditions.
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