Barreto Arthur R J, Candiotto Graziâni, Avila Harold J C, Carvalho Rafael S, Dos Santos Aline Magalhães, Prosa Mario, Benvenuti Emilia, Moschetto Salvatore, Toffanin Stefano, Capaz Rodrigo B, Muccini Michele, Cremona Marco
Organic and Molecular Optoelectronics Laboratory (LOEM), Department of Physics, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, RJ, Brazil.
Institute of Physics, Federal University of Rio de Janeiro, Rio de Janeiro 21941-909, RJ, Brazil.
ACS Appl Mater Interfaces. 2023 Jul 19;15(28):33809-33818. doi: 10.1021/acsami.3c04509. Epub 2023 Jul 5.
Organic light-emitting transistors (OLETs) are multifunctional optoelectronic devices that combine in a single structure the advantages of organic light-emitting diodes (OLEDs) and organic field-effect transistors (OFETs). However, low charge mobility and high threshold voltage are critical hurdles to practical OLET implementation. This work reports on the improvements obtained by using polyurethane films as a dielectric layer material in place of the standard poly(methyl methacrylate) (PMMA) in OLET devices. It was found that polyurethane drastically reduces the number of traps in the device, thereby improving electrical and optoelectronic device parameters. In addition, a model was developed to rationalize an anomalous behavior at the pinch-off voltage. Our findings represent a step forward to overcome the limiting factors of OLETs that prevent their use in commercial electronics by providing a simple route for low-bias device operation.
有机发光晶体管（OLETs）是多功能光电器件，在单一结构中结合了有机发光二极管（OLEDs）和有机场效应晶体管（OFETs）的优点。然而，低电荷迁移率和高阈值电压是OLET实际应用的关键障碍。这项工作报道了在OLET器件中使用聚氨酯薄膜作为介电层材料代替标准的聚甲基丙烯酸甲酯（PMMA）所取得的改进。研究发现，聚氨酯大大减少了器件中的陷阱数量，从而改善了电学和光电器件参数。此外，还开发了一个模型来解释夹断电压下的异常行为。我们的研究结果代表了向前迈出的一步，通过提供一种低偏置器件操作的简单途径，克服了阻碍OLETs在商业电子中应用的限制因素。
