Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 11, Pages 13051-13060Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22049
Keywords
polymer solar cells; hole transport layer; lanthanum nickelate; charge transport; power conversion efficiency
Funding
- Natural Science Foundation of China [21603020, 21703124, 61705026, U1663229]
- National Key Research and Development Project of China [2018YFB0407102]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201901319]
- General program of Chongqing Natural Science Foundation [cstc2019jcyj-msxmX0874]
- Financial Projects of Sichuan Science and Technology Department [2018ZYZF0062]
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In this study, a novel metal oxide, lanthanum nickelate (LNO) with a perovskite structure, was introduced into a polymer solar cell (PSC) device, replacing the PEDOT:PSS hole transport layer (HTL). The results show that the LNO-based PTB7-Th:PC71BM solar cell exhibits a higher circuit current density, power conversion efficiency, and stability compared with a device with PEDOT:PSS HTL. To understand the effect of LNO HTL on the performance of devices, the active layer morphology and charge transport characteristics in PSCs were systematically analyzed. The morphology of active layer was affected by the HTL, which further regulated the generation and transport processes of charge carrier in the PSC device. For the LNO HTL, an appropriate thickness (8 nm) and a small surface roughness (S-q = 0.7 nm) can coordinate the energy-level structure of device and improve the interface contact between the FTO electrode and PTB7-Th:PC71BM active layer, promoting the charge transport performance of device. Therefore, this work provides a new consideration for the preparation of efficient, stable, and low-cost polymer solar cells.
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