Emissive Charge-Transfer States at Hybrid Inorganic/Organic Heterojunctions Enable Low Non-Radiative Recombination and High-Performance Photodetectors.
AuthorsEisner, Flurin D.
Georgiadou, Dimitra G
Sit, Wai Yu
Anthopoulos, Thomas D.
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Material Science and Engineering Program
KAUST Solar Center (KSC)
Permanent link to this recordhttp://hdl.handle.net/10754/672811
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AbstractHybrid devices based on a heterojunction between inorganic and organic semiconductors have offered a means to combine the advantages of both classes of materials in optoelectronic devices, but, in practice, the performance of such devices has often been disappointing. Here, it is demonstrated that charge generation in hybrid inorganic–organic heterojunctions consisting of copper thiocyanate (CuSCN) and a variety of molecular acceptors (ITIC, IT-4F, Y6, PC70BM, C70, C60) proceeds via emissive charge-transfer (CT) states analogous to those found at all-organic heterojunctions. Importantly, contrary to what has been observed at previous organic–inorganic heterojunctions, the dissociation of the CT-exciton and subsequent charge separation is efficient, allowing the fabrication of planar photovoltaic devices with very low non-radiative voltage losses (0.21 ± 0.02 V). It is shown that such low non-radiative recombination enables the fabrication of simple and cost-effective near-IR (NIR) detectors with extremely low dark current (4 pA cm−2) and noise spectral density (3 fA Hz−1/2) at no external bias, leading to specific detectivities at NIR wavelengths of just under 1013 Jones, close to the performance of commercial silicon photodetectors. It is believed that this work demonstrates the possibility for hybrid heterojunctions to exploit the unique properties of both inorganic and organic semiconductors for high-performance opto-electronic devices.
CitationEisner, F., Foot, G., Yan, J., Azzouzi, M., Georgiadou, D. G., Sit, W. Y., … Nelson, J. (2021). Emissive Charge-Transfer States at Hybrid Inorganic/Organic Heterojunctions Enable Low Non-Radiative Recombination and High-Performance Photodetectors. Advanced Materials, 2104654. doi:10.1002/adma.202104654
SponsorsF.E. thanks the Engineering and Physical Sciences Research Council (EPSRC) for support via the Post-Doctoral Prize Fellowship. J.N. is grateful for funding from the EPSRC (grants EP/P005543/1 and EP/M025020/1) and the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement no 742708). H.-L.Y. acknowledges the Guangdong Major Project of Basic and Applied Basic Research (No. 2019B030302007) for funding support.
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