Journal
ENERGY TECHNOLOGY
Volume 5, Issue 2, Pages 312-320Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ente.201600303
Keywords
charge transfer; hole transport; hydrophobic effect; perovskites; solar cells
Categories
Funding
- National High-tech R&D Program(863 Program) [2015AA033402]
- Tianjin Science and Technology Plan Projects [13ZCZDGX00900, 14TXGCCX00017]
- high-performance computing center of Tianjin University, China
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Two hole-transporting materials (HTMs) based on N,N,N,N- tetraphenylbenzidine (TPB) and MeO-triphenylamine (MOTPA) are synthesized. The HTMs offer outstanding thermal stability, film-forming properties, and hole mobilities. Perovskite solar cells (PSCs) are prepared using either pristine HTM layers or layers doped with cobalt salts. The nondoped PSCs with as-synthesized HTMs show better performance compared to spiro-OMeTAD, especially for long-time stability in ambient air. The power conversion efficiency (PCE) of the cells decreases by only 3% after 600h of storage. The nondoped hole-transport layer (HTL) are hydrophobic, with a contact angle of 94.3 degrees to water. The moisture-repelling ability of these HTMs are demonstrated by exposing the nondoped PSCs to an atmosphere saturated with water vapor. The PCE of doped PSCs with spiro-OMeTAD as HTL decreased 53%, while that of nondoped PSCs with the as-synthesized HTMs as HTL only decreased 27% after 15min. These result thus show a new method to improve the operational stability of PSCs, especially at high humidity levels.
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