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Stable Perovskite Solar Cells Using Molecularly Engineered Functionalized Oligothiophenes as Low‐Cost Hole‐Transporting Materials
Author(s) -
Joseph Vellaichamy,
Sutanto Albertus Adrian,
Igci Cansu,
Syzgantseva Olga A.,
Jankauskas Vygintas,
Rakstys Kasparas,
Queloz Valentin I. E.,
Kanda Hiroyuki,
Huang PingYu,
Ni JenShyang,
Kinge Sachin,
Chen MingChou,
Nazeeruddin Mohammad Khaja
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202100783
Subject(s) - materials science , energy conversion efficiency , perovskite (structure) , thermal stability , terthiophene , thermal decomposition , chemical engineering , nanotechnology , optoelectronics , polymer , organic chemistry , chemistry , composite material , engineering
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 °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.