Indolo[3,2-b]indole-based crystalline hole-transporting material for highly efficient perovskite solar cells

Illhun Cho, Nam Joong Jeon, Oh Kyu Kwon, Dong Won Kim, Eui Hyuk Jung, Jun Hong Noh, Jangwon Seo, Sang Il Seok, Soo Young Park

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98 Citations (Scopus)


We have designed and synthesized fluorinated indolo[3,2-b]indole (IDID) derivatives as crystalline hole-transporting materials (HTM) for perovskite solar cells. The fluorinated IDID backbone enables a tight molecular arrangement stacked by strong π-π interactions, leading to a higher hole mobility than that of the current HTM standard, p,p-spiro-OMeTAD, with a spherical shape and amorphous morphology. Moreover, the photoluminescence quenching in a perovskite/HTM film is more effective at the interface of the perovskite with IDIDF as compared to that of p,p-spiro-OMeTAD. As a consequence, the device fabricated using IDIDF shows superior photovoltaic properties compared to that using p,p-spiro-OMeTAD, exhibiting an optimal performance of 19%. Thus, this remarkable result demonstrates IDID core-based materials as a new class of HTMs for highly efficient perovskite solar cells.

Original languageEnglish
Pages (from-to)734-741
Number of pages8
JournalChemical Science
Issue number1
Publication statusPublished - 2016
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) through a grant funded by the Korean Government (MSIP; No. 2009-0081571[RIAM0417-20150013]) and the Global Frontier R&D Program at the Center for Multiscale Energy Systems funded by the National Research Foundation under the Ministry of Science, ICT & Future Planning, Korea (2012M3A6A7055540) (Global Frontier R&D Program on Center for Multiscale Energy System) and NRF-2015M1A2A2056542. This work was also supported by a grant from the Korea Research Institute of Chemical Technology (KRICT), Republic of Korea (KK1602-A01). N. J. Jeon also acknowledges support by the Basic Science Research Program through the NRF, funded by the Ministry of Education (NRF-2015R1A6A3A04058164)

Publisher Copyright:
© The Royal Society of Chemistry.

ASJC Scopus subject areas

  • Chemistry(all)


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