Enhancing performance and stability of perovskite solar cells using hole transport layer of small molecule and conjugated polymer blend

Hansu Hwang, Sungmin Park, Jin Hyuck Heo, Wansun Kim, Hyungju Ahn, Taek Soo Kim, Sang Hyuk Im, Hae Jung Son

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Here, we develop a method to prepare a dopant-free hole transporting material by blending an organic semiconductor and a conjugated polymer with 1,8-diiodooctane (DIO) additive. The normal-type solar cell based on the hole transporting material (HTM) blend with DIO + PCDTBT shows enhanced efficiency up to 18.0% compared to 14.7% for the device using the pristine small molecule. Incorporation of DIO results in increased crystallinity, while the conjugated polymer induces an intermolecular network for efficient charge transport with improved film morphology. Consequently, the HTM blend with DIO + PCDTBT shows a higher hole mobility and more efficient charge transfer at the perovskite/hole transporting layer interface compared with the pristine HTM. Furthermore, the solar cell introducing the HTM blend with DIO shows high mechanical and moisture stability; the compact and homogeneous film of high crystalline HTM shows more adhesive contact with perovskite and effectively prevents the penetration of moisture. The efficiency of the unencapsulated device using a small molecular HTM decreases to 60%, whereas the corresponding device with HTM blend maintains 80% performance after storage under 85% relative humidity and 85 °C.

Original languageEnglish
Pages (from-to)167-175
Number of pages9
JournalJournal of Power Sources
Publication statusPublished - 2019 Apr 1

Bibliographical note

Funding Information:
This work was supported from the Global Frontier R&D Program on Center for Multiscale Energy System ( 2015R1A1A1A05001115 ) and the KIST institutional programs ; this work was also supported by New and Renewable Energy Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Ministry of Knowledge Economy (MKE) ( 20163030013620 ).

Publisher Copyright:
© 2019 Elsevier B.V.


  • Dopant-free
  • Enhanced stability
  • Hole transporting materials
  • Perovskite solar cell
  • Polymer blend

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering


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