This work demonstrates flexible, transparent phototransistors that can detect visible light with nontoxic organic active materials on biodegradable substrates toward environment‐friendly electronics. The molybdenum trioxide (MoO₃)‐buffered indium zinc oxide as high‐performance hole injector and transparent electrodes is applied for the first time to organic phototransistors on cellulose nanofibrillated fiber substrates to achieve more than 70% of transmittance in the visible range (400–750 nm) while showing high conductivity under multiple bendings. Excellent electrical switching characteristics are obtained from transistors using a pentacene active layer with a saturation mobility value of 1.40 cm² V⁻¹ s⁻¹. The phototransistors, which can detect visible light and perform in two operation modes, exhibit a maximum responsivity of 54.8 A W⁻¹ and a photosensitivity of 24.4 under white light illumination at an intensity of 0.12 mW cm⁻². Moreover, the devices show a stable operation during mechanical bending tests with radii ranging from 100 to 5 mm and cyclic bending tests of up to 2000 cycles at a fixed radius of 5 mm. The results suggest that these flexible phototransistors with properties of transparency and biodegradability have considerable potential for use in low‐cost and eco‐friendly disposable sensor systems.

中文翻译：

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可生物降解纤维素纳米原纤化纤维基材上的柔性和透明有机光电晶体管

这项工作演示了灵活，透明的光电晶体管，该晶体管可以利用可生物降解的基板上的无毒有机活性材料检测可见光，从而达到环保电子产品的要求。三氧化钼（MoO ₃）缓冲的铟锌氧化物作为高性能的空穴注入器和透明电极，首次应用于纤维素纳米原纤化纤维基材上的有机光电晶体管，以在可见光范围内实现超过70％的透射率（400– 750 nm），同时在多次弯曲下显示出高导电性。使用饱和迁移率值为1.40 cm ² V ^-1 s ^-1的并五苯有源层的晶体管可获得出色的电开关特性。可以检测可见光并以两种操作模式执行的光电晶体管在白光照射下以0.12 mW cm ^-2的强度显示出最大响应度为54.8 AW ^-1和光敏度为24.4 。此外，该设备在半径为100至5毫米的机械弯曲测试以及在5毫米的固定半径下最多进行2000次循环的循环弯曲测试中均显示出稳定的运行状态。结果表明，这些具有透明性和可生物降解性的柔性光电晶体管在低成本和生态友好型一次性传感器系统中具有巨大的潜力。