Publication date: 22nd July 2026
Organic phototransistors (OPTs) are promising as flexible, low-cost devices for flexible displays, wearable electronics, biosensors, environmental monitoring and, also for developing new concept devices for visible light communication (VLC) systems. In this work, we report on a dinaphtho-thieno-thiophene (DNTT) based OPT optimized for detecting blue light. The device employs an Al/Al2O3/DNTT/Au layered structure fabricated at ≤ 100 °C on PEN (see fig.1) by shadow-mask patterning. Key performance metrics include a high field-effect mobility (≈ 4.2 cm²/V·s) and a low contact resistance (≈ 12 kΩ·cm), which together enable efficient charge transport. Under low-intensity illumination (≈ 10⁻⁸ W/cm²) the phototransistor achieves an exceptional responsivity of ≈ 250 A/W, indicating significant photoconductive gain. Even at higher light levels (≈ 10⁻3 W/cm²), it maintains a large photosensitivity up to ≈ 120. High-frequency tests demonstrate a fast temporal response is realized (rise time ≈ 6.6 μs). The device thus offers a rare combination of high sensitivity and fast response. These results represent a substantial advancement for organic optoelectronics. It is worth noting that the OPTs we have developed are fully compatible with next-generation VLC receivers and other applications requiring lightweight, high-performance photodetectors in the visible range.
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