Photocurrent in Metal-Halide Perovskite/Organic Semiconductor Heterostructures: Impact of Microstructure on Charge Generation Efficiency
- 16 February 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 13 (8), 10231-10238
- https://doi.org/10.1021/acsami.0c21992
Abstract
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.Funding Information
- U.S. Department of Energy (DESC0014579)
- National Science Foundation (1849213, CMMI 1824674, DMR 1420541, DMR 1627453, DMR DMREF 1627428, DMR DMREF 1627925, ECCS 1608095)
This publication has 53 references indexed in Scilit:
- High‐Performance Perovskite–Graphene Hybrid PhotodetectorAdvanced Materials, 2014
- Enabling Ideal Selective Solar Absorption with 2D Metallic Dielectric Photonic CrystalsAdvanced Materials, 2014
- Rational Design of Organic Semiconductors for Texture Control and Self‐Patterning on Halogenated SurfacesAdvanced Functional Materials, 2014
- High-Performance Perovskite-Polymer Hybrid Solar Cells via Electronic Coupling with Fullerene MonolayersNano Letters, 2013
- Quantifying Resistances across Nanoscale Low- and High-Angle Interspherulite Boundaries in Solution-Processed Organic Semiconductor Thin FilmsACS Nano, 2012
- Tailored interfaces for self-patterning organic thin-film transistorsJournal of Materials Chemistry, 2012
- Understanding Heterogeneous Nucleation in Binary, Solution-Processed, Organic Semiconductor Thin FilmsChemistry of Materials, 2012
- Guiding Crystallization around Bends and Sharp CornersAdvanced Materials, 2012
- Large modulation of carrier transport by grain-boundary molecular packing and microstructure in organic thin filmsNature Materials, 2009
- Chromophore Fluorination Enhances Crystallization and Stability of Soluble Anthradithiophene SemiconductorsJournal of the American Chemical Society, 2008