Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
DOI: https://doi.org/10.29363/nanoge.matsus.2024.011
Publication date: 18th December 2023
Lead halide perovskite and organic semiconductors have been promising classes of materials for photodetector (PD) applications. However, despite their high performances with low noise and specific detectivity (D*) values exceeding the one of silicon detectors, perovskite PDs working regime is limited to the visible and the first fraction of near-infrared (NIR) spectrum due to their bandgap.1,2 Differently, organic PDs have the advantage of tunable absorption thanks to their chemical design. In this work, we fabricated perovskite-organic heterojunction (POH) PDs with extended absorption up to 900 nm, thanks to the deposition of a donor:acceptor bulk-heterojunction (BHJ) layer on top of the perovskite. We systematically studied the effect of the energetic of the donor materials on the dark current (Jd) of the device by using polymers from the PBDB-T family (PCE12, PM6 and PM7). By using this approach, PM7-based POH delivered ultra-low noise of 2 x 10-14 A Hz-1/2 and high specific detectivity D* of 4.7 x 1012 Jones (-0.5 V) at 840 nm. This was achieved by increasing the energetic barrier between the HOMO of the donor and the LUMO of the acceptor as explained by our analytical model.3 We found that the donor sites effectively act as recombination centres at the perovskite/BHJ interface, affecting Jd. In particular, PM7 with a deeper HOMO level, formed a larger LUMO(Y6)-HOMO(D) gap compared to PM6. This resulted in a smaller contribution of the HOMO of the donor to the dark current, similar to the intrinsic traps introduced by Y6 at perovskite/BHJ interface.
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