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

Research output: Contribution to journalArticlepeer-review

93 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

ASJC Scopus subject areas

  • Chemistry(all)


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