Organic phototransistors based on solution grown, ordered single crystalline arrays of a π-conjugated molecule
Organic phototransistors based on solution grown, ordered single crystalline arrays of a π-conjugated molecule
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DOI：
10.1039/c2jm14179e
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发表时间：
2012-01
影响因子：
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通讯作者：
B. Mukherjee;K. Sim;T. Shin;Junghyun Lee;M. Mukherjee;M. Ree;S. Pyo
中科院分区：
文献类型：
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作者：
B. Mukherjee;K. Sim;T. Shin;Junghyun Lee;M. Mukherjee;M. Ree;S. Pyo
采用溶液法生长了高质量有序排列的π共轭有机分子N，N′-二辛基-3，4，9，10-二萘嵌苯四羧酸二酰亚胺（PTCDI-C8）单晶，并用于制备低成本、高性能的有机光电晶体管（OPT）。使用2D-GIXD测量研究了微结构的单晶性质。使用周期性阵列的细长晶体制造的有机场效应晶体管表现出的光响应度（P）约为。1 A W−1，在VG = 12 V时，光暗电流比（Ion/Ioff）为2.5 × 103，最大P约为1.5 × 103。7 A W−1，高栅极偏置状态（VG = 50 V），光功率约为7.5 mW cm-2。使用聚合物栅极电介质，OPT在黑暗和光照下都表现出非常稳定的n型特性，并表现出可重复的光开关行为。光电流对栅极/漏极电压和照明强度的依赖性提供了一种有效的方法来控制活性材料中产生的光载流子的数量，从而能够精确调节器件的性能。具有有序晶体阵列的OPTs和PTCDI-C8薄膜之间的性能比较证实，在晶体器件中更好地实现了材料的固有特性，这可能是因为更高的载流子迁移率和更好的电荷传输能力。这种一步，基于溶液的，自组装制造的多功能（光检测，光开关，信号放大）的光电器件有可能帮助开发具有高质量的微/纳米结构的有机半导体的大规模应用和低成本的光电器件。
High quality, single crystalline, ordered arrays of a π-conjugated organic molecule, N,N′-dioctyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI-C8), were grown by solution processing and used to fabricate a low-cost, high-performance organic phototransistor (OPT). The single crystalline nature of the microstructure was investigated using 2D-GIXD measurement. The organic field-effect transistor fabricated using periodic arrays of elongated crystals exhibited a photoresponsivity (P) of ca. 1 A W−1 and a photo to dark current ratio (Ion/Ioff) of 2.5 × 103 at VG = 12 V and a maximum P of ca. 7 A W−1 at the high gate bias regime (VG = 50 V) with an optical power of ca. 7.5 mW cm−2. With polymeric gate dielectric, the OPT exhibited very stable n-type characteristics both in the dark and under light illumination and showed reproducible photo-switching behavior. The dependence of the photocurrent on the gate/drain voltage and on illumination intensity provided an effective way to control the number of photo-carriers generated in the active material, enabling the precise tuning of the device's performance. Performance comparison between OPTs with ordered crystal arrays and thin films of PTCDI-C8 confirmed that the material's intrinsic properties were better realized in the crystalline device, presumably because of higher charge carrier mobility and better charge transport capability. This one-step, solution-based, self-assembly fabrication of multifunctional (photodetection, photoswitching, signal amplification) optoelectronic devices has potential to aid the development of organic semiconductors with high-quality micro/nanostructures for large-scale application and low-cost optoelectronic devices.