Emissive Charge-Transfer States at Hybrid Inorganic/Organic Heterojunctions Enable Low Non-Radiative Recombination and High-Performance Photodetectors.
Type
ArticleAuthors
Eisner, Flurin D.
Foot, Georgie
Yan, Jun

Azzouzi, Mohammed

Georgiadou, Dimitra G

Sit, Wai Yu
Firdaus, Yuliar

Zhang, Guichuan

Lin, Yen-Hung

Yip, Hin-Lap

Anthopoulos, Thomas D.

Nelson, Jenny
KAUST Department
Physical Science and Engineering (PSE) DivisionMaterial Science and Engineering Program
KAUST Solar Center (KSC)
Date
2021-10-05Online Publication Date
2021-10-05Print Publication Date
2022-06Submitted Date
2021-06-17Permanent link to this record
http://hdl.handle.net/10754/672811
Metadata
Show full item recordAbstract
Hybrid 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.Citation
Eisner, 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.202104654Sponsors
F.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.Publisher
WileyJournal
Advanced MaterialsPubMed ID
34611947Additional Links
https://onlinelibrary.wiley.com/doi/10.1002/adma.202104654ae974a485f413a2113503eed53cd6c53
10.1002/adma.202104654
Scopus Count
Except where otherwise noted, this item's license is described as This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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