Solution-processed high-performing ambipolar organic phototransistors (OPTs) can enable low-cost integrated circuits. Here, a heteroatom engineering approach to modify the electron affinity of a low band gap diketopyrrolopyrole (DPP) co-polymer, resulting in well-balanced charge transport, a more preferential edge-on orientation and higher crystallinity, is demonstrated. Changing the comonomer heteroatom from sulfur (benzothiadiazole (BT)) to oxygen (benzooxadiazole (BO)) leads to an increased electron affinity and introduces higher ambipolarity. Organic thin film transistors fabricated from the novel PDPP-BO exhibit charge carrier mobility of 0.6 and 0.3 cm² Vs⁻¹ for electrons and holes, respectively. Due to the high sensitivity of the PDPP-based material and the balanced transport in PDPP-BO, its application as an NIR detector in an OPT architecture is presented. By maintaining a high on/off ratio (9 × 10⁴), ambipolar OPTs are shown with photoresponsivity of 69 and 99 A W⁻¹ and specific detectivity of 8 × 10⁷ for the p-type operation and 4 × 10⁹ Jones for the n-type regime. The high symmetric NIR-ambipolar OPTs are also evaluated as ambipolar photo-inverters, and show a 46% gain enhancement under illumination.

中文翻译：

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共轭聚合物杂原子工程实现高探测率对称双极光电晶体管

经过溶液处理的高性能双极有机光电晶体管 (OPT) 可以实现低成本集成电路。在这里，展示了一种杂原子工程方法来改变低带隙二酮吡咯并吡咯（DPP）共聚物的电子亲和力，从而实现良好平衡的电荷传输、更优先的边缘取向和更高的结晶度。将共聚单体杂原子从硫（苯并噻二唑（BT））改为氧（苯并恶二唑（BO））会导致电子亲和力增加并引入更高的双极性。由新型PDPP-BO制造的有机薄膜晶体管的电子和空穴载流子迁移率分别为0.6和0.3 cm ²  Vs- ¹ 。由于 PDPP 基材料的高灵敏度和 PDPP-BO 中的平衡传输，其在 OPT 架构中作为近红外探测器的应用被提出。通过保持高开/关比 (9 × 10 ⁴ )，双极 OPT 的光响应度为 69 和 99 A W⁻ ¹ ， p 型操作的特异性探测率为 8 × 10 ^{7 ，p 型操作的特异性探测率为 4 × 10 9} Jones。 n型政权。高对称近红外双极 OPT 也被评估为双极光电逆变器，并在照明下显示出 46% 的增益增强。