Efficient hybrid colloidal quantum dot/organic solar cells mediated by near-infrared sensitizing small molecules

Se Woong Baek, Sunhong Jun, Byeongsu Kim, Andrew H. Proppe, Olivier Ouellette, Oleksandr Voznyy, Changjo Kim, Junho Kim, Grant Walters, Jung Hoon Song, Sohee Jeong, Hye Ryung Byun, Mun Seok Jeong, Sjoerd Hoogland, F. Pelayo García de Arquer, Shana O. Kelley, Jung Yong Lee, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

124 Scopus citations

Abstract

Solution-processed semiconductors are promising materials to realize optoelectronic devices that combine high performance with inexpensive manufacturing. In particular, the exploitation of colloidal quantum dots (CQDs) capable of harvesting infrared photons, in conjunction with visible-absorbing organic chromophores, has been demonstrated as an interesting route. Unfortunately, CQD/organic hybrid photovoltaics have been limited to power conversion efficiencies (PCEs) below 10% due to chemical mismatch and difficulties in facilitating charge collection. Here we devise a hybrid architecture that overcomes these limitations by introducing small molecules into the CQD/organic stacked structure. The small molecule complements CQD absorption and creates an exciton cascade with the host polymer, thus enabling efficient energy transfer and also promoting exciton dissociation at heterointerfaces. The resulting hybrid solar cells exhibit PCEs of 13.1% and retain over 80% of their initial PCE after 150 h of continuous operation unencapsulated, outperforming present air-processed solution-cast CQD/organic photovoltaics.

Original languageEnglish (US)
Pages (from-to)969-976
Number of pages8
JournalNature Energy
Volume4
Issue number11
DOIs
StatePublished - Nov 1 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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