Abstract:
:Tandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm-2. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Jia Z,Qin S,Meng L,Ma Q,Angunawela I,Zhang J,Li X,He Y,Lai W,Li N,Ade H,Brabec CJ,Li Ydoi
10.1038/s41467-020-20431-6subject
Has Abstractpub_date
2021-01-08 00:00:00pages
178issue
1issn
2041-1723pii
10.1038/s41467-020-20431-6journal_volume
12pub_type
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