Extended Detection Wavelength to 940 nm in Narrowband Photomultiplication-Type Organic Photodetectors by Introducing Perovskite Quantum Dot Interlayer
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We demonstrated a novel charge-injection-narrowing organic photodetector (CIN OPD) that operates in the NIR range. By incorporating perovskite quantum dots (PQDs) as an interlayer to induce photomultiplication (PM), we eliminated the need for trap sites within the active layer, enabling the use of a donor:acceptor BHJ as the thick active layer. By optimizing the thickness of the BHJ film, we achieved narrowband detection at λ = 940 nm, which is the longest wavelength yet detected using a CIN OPD. The extended wavelength range was enabled by the use of acceptor materials in the active layer, which effectively absorbed λ = 940 nm light. The CIN OPD demonstrated an exceptional EQE of 39000% with a narrow FWHM of 98 nm at a 60 V bias. The device had a high D* of 2.4 × 1012 Jones and a short response time of 4.1 ms. This device design represents a significant advance in filter-free, highly efficient photodetectors.