Photocurrent in Metal-Halide Perovskite/Organic Semiconductor Heterostructures: Impact of Microstructure on Charge Generation Efficiency

Colin Tyznik, James Lee, Jeni Sorli, Xiaojie Liu, Emma K. Holland, Cynthia S. Day, John E. Anthony, Yueh Lin Loo, Z. Valy Vardeny, Oana D. Jurchescu

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Hybrid organic-inorganic metal-halide perovskites have emerged as versatile materials for enabling low-cost, mechanically flexible optoelectronic applications. The progress has been commendable; however, technological breakthroughs have outgrown the basic understanding of processes occurring in bulk and at device interfaces. Here, we investigated the photocurrent at perovskite/organic semiconductor interfaces in relation to the microstructure of electronically active layers. We found that the photocurrent response is significantly enhanced in the bilayer structure as a result of a more efficient dissociation of the photogenerated excitons and trions in the perovskite layer. The increase in the grain size within the organic semiconductor layer results in reduced trapping and further enhances the photocurrent by extending the photocarriers' lifetime. The photodetector responsivity and detectivity have improved by 1 order of magnitude in the optimized samples, reaching values of 6.1 ± 1.1 A W-1, and 1.5 × 1011 ± 4.7 × 1010 Jones, respectively, and the current-voltage hysteresis has been eliminated. Our results highlight the importance of fine-tuning film microstructure in reducing the loss processes in thin-film optoelectronics based on metal-halide semiconductors and provide a powerful interfacial design method to consistently achieve high-performance photodetectors.

Original languageEnglish
Pages (from-to)10231-10238
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number8
StatePublished - Mar 3 2021

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society. All rights reserved.


  • charge transport
  • organic semiconductors
  • perovskite
  • photocurrent
  • photodetector
  • recombination

ASJC Scopus subject areas

  • Materials Science (all)


Dive into the research topics of 'Photocurrent in Metal-Halide Perovskite/Organic Semiconductor Heterostructures: Impact of Microstructure on Charge Generation Efficiency'. Together they form a unique fingerprint.

Cite this