Revisiting the Classical Wide-Bandgap HOMO and Random Copolymers for Indoor Artificial Light Photovoltaics

Jeonga Kim, Muhammad Ahsan Saeed, Sung Hyun Kim, Dongmin Lee, Yongchan Jang, Jin Su Park, Donggu Lee, Changyeon Lee, Bumjoon J. Kim, Han Young Woo, Jae Won Shim, Wonho Lee

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Organic indoor photovoltaics (IPVs) are attractive energy harvesting devices for low-power consumption electronic devices and the Internet of Things (IoTs) owing to their properties such as being lightweight, semitransparent, having multicoloring capability, and flexibility. It is important to match the absorption range of photoactive materials with the emission spectra of indoor light sources that have a visible range of 400–700 nm for IPVs to provide sustainable, high-power density. To this end, benzo[1,2-b:4,5-b′]dithiophene-based homopolymer (PBDTT) is synthesized as a polymer donor, which is a classical material that has a wide bandgap with a deep highest occupied molecular orbitals (HOMO) level, and a series of random copolymers by incorporating thieno[3,4-c]pyrrole-4,6,-dione (TPD) as a weak electron acceptor unit in PBDTT. The composition of the TPD unit is varied to fine tune the absorption range of the polymers; the polymer containing 70% TPD (B30T70) perfectly covers the entire range of indoor lamps such as light-emitting diodes (LEDs) and fluorescent lamp (FL). Consequently, B30T70 shows a dramatic enhancement of the power conversion efficiency (PCE) from 1-sun (PCE: 6.0%) to the indoor environment (PCE: 18.3%) when fabricating organic IPVs by blending with PC71BM. The simple, easy molecular design guidelines are suggested to develop photoactive materials for efficient organic IPVs.

Original languageEnglish
Article number2200279
JournalMacromolecular Rapid Communications
Issue number19
Publication statusPublished - 2022 Oct

Bibliographical note

Funding Information:
J.K. and M.A.S. contributed equally to this work. This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF‐2020R1I1A306779). This work was also supported by the NRF grant funded by the Korea government (MSIT) (2022R1A2C2009523, 2019R1A6A1A11044070). C.L. acknowledges the use of the Dual Source and Environmental X‐ray scattering facility operated by the Laboratory for Research on the Structure of Matter at the University of Pennsylvania (NSF MRSEC 17‐ 20530).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.


  • control of absorption range
  • indoor photovoltaics
  • organic photovoltaics
  • random copolymers
  • wide-bandgap polymers

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Organic Chemistry


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