Journal
SMALL
Volume 17, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202100783
Keywords
functionalized oligothiophenes; low-cost hole transporting material; n-i-p configuration; stable perovskite solar cells
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Funding
- Swiss National Science Foundation (SNSF) funding through the Synergia Grant EPISODE [CRSII5_171000]
- MOST [MOST 109-3111-8-008-001]
- NCU-DSM Research Center
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The study synthesized BT-4D, TT-4D, and QT-4D compounds for low-cost HTMs in PSCs, with BT-4D showing the best efficiency and stability. BT-4D has a high thermal decomposition temperature of over 400 degrees Celsius, allowing PSCs to maintain up to 98% of their initial efficiency after prolonged illumination.
Triarylamine-substituted bithiophene (BT-4D), terthiophene (TT-4D), and quarterthiophene (QT-4D) small molecules are synthesized and used as low-cost hole-transporting materials (HTMs) for perovskite solar cells (PSCs). The optoelectronic, electrochemical, and thermal properties of the compounds are investigated systematically. The BT-4D, TT-4D, and QT-4D compounds exhibit thermal decomposition temperature over 400 degrees C. The n-i-p configured perovskite solar cells (PSCs) fabricated with BT-4D as HTM show the maximum power conversion efficiency (PCE) of 19.34% owing to its better hole-extracting properties and film formation compared to TT-4D and QT-4D, which exhibit PCE of 17% and 16%, respectively. Importantly, PSCs using BT-4D demonstrate exceptional stability by retaining 98% of its initial PCE after 1186 h of continuous 1 sun illumination. The remarkable long-term stability and facile synthetic procedure of BT-4D show a great promise for efficient, stable, and low-cost HTMs for PSCs for commercial applications.
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