Journal
ADVANCED MATERIALS INTERFACES
Volume 5, Issue 19, Pages -Publisher
WILEY
DOI: 10.1002/admi.201800645
Keywords
5-aminovaleric acid; interface stability; perovskite solar cells; surface modification
Funding
- National Natural Science Foundation of China [51672094, 51661135023]
- National Key R&D Program of China [2016YFC0205002]
- China Postdoctoral Science Foundation [2016M602286]
- Self-determined and Innovative Research Funds of HUST [2016JCTD111]
- Wuhan Youth Science and Technology Plan [2017050304010297]
- Guangdong Natural Science Foundation [2017A030313342]
- Basic Research Project of Shenzhen Science and Technology Plan [JCYJ201005280434A]
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Kinds of interfacial engineering technologies are explored in perovskite solar cells (PSCs), which are proved to be benefit for the devices to achieve higher efficiency, less hysteresis, and/or better stability. In this work, in an inverted p-i-n structured PSC, a monolayer of 5-aminovaleric acid (5-AVA) molecules with bifunctional groups is introduced to modify the surface of p-NiMgLiO compact hole transport layer (HTL). This key surface modification is not only improving the resultant perovskite film's quality, but also facilitating efficient charge extraction at the HTL/perovskite interface, which result in improved power conversion efficiency (PCE) from 18.0 to 19.4%. Furthermore, the 5-AVA-modified device can withstand much higher poling bias (>1.8 V) for a longer time than the pristine one, showing little nonsteady state current and excellent consistency of forward and reverse photocurrent-voltage curves after high bias poling. Benefitting from the exceptionally stable interface, the 5-AVA-modified device shows much improved long-term stability, which can maintain over 90% of its initial PCE after 300 h continuous light soaking at maximum power point tracking condition.
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