Organic optoelectronics has progressed excitingly in recent years, mainly due to the innovation of donor and acceptor systems. Organic photodetectors based on novel semiconductor materials and well-designed device architectures have also been reported with improved device performance. However, most of them were photodiodes, and it is challenging to integrate them into the well-established readout circuits. Organic phototransistors are mainly based on the hybrid strategy, composed of either hybrid films or multilayer device structures, which complicates charge transfer and charge transport. Most of the organic devices also suffer from poor stability. In this work, we introduce a recently developed p-type copolymer, D18, to fabricate high-performance phototransistors. D18 possesses excellent charge generation, high mobility, and unipolar charge transport, which fulfill the generic design rule of organic phototransistors. The optimized phototransistors based on D18 exhibited extremely low dark current (∼10 pA) and noise (∼10 fA/Hz^1/2), a high detectivity of 4 × 10¹³ Jones, a swift response of <5 ms, and excellent device stability. We also demonstrated flexible phototransistors with decent performance metrics, indicating great potential for next-generation solution-processed photodetectors and flexible electronic devices.

中文翻译：

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基于 D18 的高性能有机光电晶体管，一种高迁移率和单极性聚合物

近年来，有机光电子学取得了令人振奋的进展，这主要归功于施主和受主系统的创新。还报道了基于新型半导体材料和精心设计的器件架构的有机光电探测器具有改进的器件性能。然而，它们中的大多数是光电二极管，将它们集成到完善的读出电路中具有挑战性。有机光电晶体管主要基于混合策略，由混合薄膜或多层器件结构组成，使电荷转移和电荷传输复杂化。大多数有机器件也存在稳定性差的问题。在这项工作中，我们介绍了最近开发的 p 型共聚物 D18，以制造高性能光电晶体管。D18 具有优异的电荷产生、高迁移率、和单极电荷传输，满足有机光电晶体管的通用设计规则。基于 D18 的优化光电晶体管表现出极低的暗电流 (∼10 pA) 和噪声 (∼10 fA/Hz^1/2 )、4 × 10 ¹³ Jones的高检测率、<5 ms 的快速响应以及出色的设备稳定性。我们还展示了具有良好性能指标的柔性光电晶体管，表明下一代溶液处理光电探测器和柔性电子设备的巨大潜力。