Ni-doped α-Fe 2 O 3 as electron transporting material for planar heterojunction perovskite solar cells with improved efficiency, reduced hysteresis and ultraviolet stability
We report on high-efficiency planar heterojunction perovskite solar cells (PSCs) employing Ni-doped alpha-Fe2O3 as electron-transporting layer (ETL). The suitable addition of nickel (Ni) dopant could enhance the electron conductivity as well as induce downward shift of the conduction band minimum for alpha-Fe2O3, which facilitate electrons injection and transfer from the conduction band of the perovskite. As a consequence, a substantial reduction in the charge accumulation at the perovskite/ETL interface makes the device much less sensitive to scanning rate and direction, i.e., lower hysteresis. With a reverse scan for the optimized PSC under standard AM-1.5 sunlight illumination, it generates a competitive power conversion efficiency (PCE) of 14.2% with a large short circuit current (J(sc)) of 22.35 mA/cm(2), an open circuit photovoltage (V-oc) of 0.92 V and a fill factor (FF) of 69.1%. Due to the small J-V hysteresis behavior, a higher stabilized PCE up to 11.6% near the maximum power point can be reached for the device fabricated with 4 mol% Ni-doped alpha-Fe2O3 ETL compared with the undoped alpha-Fe2O3 based cell (9.2%). Furthermore, a good stability of devices with exposure to ambient air and high levels of ultraviolet (UV)-light can be achieved. Overall, our results demonstrate that the simple solution-processed Ni-doped alpha-Fe2O3 can be a good candidate of the n-type collection layer for commercialization of PSCs.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NNSFC); Ministry of Education of the People's Republic of China - New Century Excellent Talents In University Program; Fundamental Research Funds for the Central Universities; USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1411050
- Journal Information:
- Nano Energy, Vol. 38, Issue C; ISSN 2211-2855
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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