Structural engineering of porphyrin-based small molecules as donors for efficient organic solar cells

Hongda Wang, Liangang Xiao, Lei Yan, Song Chen, Xunjin Zhu, Xiaobin Peng, Xingzhu Wang, Wai Kwok Wong, Wai Yeung Wong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

62 Citations (Scopus)

Abstract

Porphyrin-based small molecules as donors have long been ignored in bulky heterojunction organic solar cells due to their unfavorable aggregation and the low charge mobility. With the aim of striking a delicate balance between molecular design, morphology, interfacial layer and device fabrication to maximize the power conversion efficiency (PCE) of organic solar cells, three comparable porphyrin-based small molecules with an acceptor-donor-acceptor configuration have been developed for use as donor materials in solution processed small molecule bulk heterojunction organic solar cells. In these molecules, electron-deficient 3-ethylrhodanine is introduced into the electron-rich porphyrin core through 5,15-bis(phenylethynyl) linkers. Structural engineering with 10,20-bis(2-hexylnonyl) aliphatic peripheral substituent on the porphyrin core, instead of the aromatic substituents such as 10,20-bis[3,5-di(dodecyloxyl)phenyl], and 10,20-bis(4-dodecyloxylphenyl), can simultaneously facilitate stronger intermolecular π-π stacking and higher charge transfer mobility in the film, leading to a maximum PCE of 7.70% in a conventional device. The inverted devices have also been demonstrated to have long-term ambient stability and a comparable PCE of 7.55%.
Original languageEnglish
Pages (from-to)4301-4307
Number of pages7
JournalChemical Science
Volume7
Issue number7
DOIs
Publication statusPublished - 1 Jan 2016
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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