期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 10, 页码 10433-10441出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c00367
关键词
atomic layer deposition; mesoporous-TiO2; hysteresis; recombination; stability; efficiency
资金
- National Research Foundation of Korea (NRF) [NRF-2017R1A2B4008117]
- Priority Research Centers Program - Ministry of Education, Science and Technology through the National Research Foundation of Korea (NRF) [NRF-2018R1A6A1A03024334]
- Deanship of Scientific Research at King Khalid University [RGP2/86/42]
Surface passivation with an ultrathin layer of tantalum pentoxide has been shown to reduce recombination and improve charge transport in mesoscopic perovskite solar cells. An optimized thickness of Ta2O5 led to a high-power conversion efficiency of 21.25% and enhanced stability compared to unmodified devices. This study highlights the importance of surface passivation for improving the performance of mesoscopic PSCs.
Surface passivation of perovskite solar cells (PSCs) has been considered as an effective way to improve the efficiency and stability of devices. Here, we study the influence of an ultrathin layer of tantalum pentoxide (Ta2O5) as a passivation layer in the mesoscopic heterojunction PSCs. This material was conformally coated on top of mesoporous TiO2 (mp-TiO2) with various thicknesses by the atomic layer deposition technique. We observe that Ta2O5 reduces the recombination at the perovskite/mp-TiO2 contact surface and improves the charge transport, as proved by photoluminescence spectroscopies. With an optimized thickness of Ta2O5 (similar to 1.9 nm), a high-power conversion efficiency of 21.25% was obtained for the Ta2O5-modified device, mostly because of the enhancement of the open-circuit voltage (V-oc). In addition, our modified cell exhibits low hysteresis, improved shelf life, and thermal and UV light stabilities compared to the unmodified device. Our study demonstrates the importance of surface passivation in mesoscopic PSCs.
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