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Organic charge-transfer interface enhanced graphene hybrid phototransistors
Organic Electronics ( IF 3.2 ) Pub Date : 2018-10-06 , DOI: 10.1016/j.orgel.2018.10.004
Xiaolong Liu , Xiaoqing Chen , Juxia Yi , Zhongzhong Luo , Haiyan Nan , Hui Guo , Zhenhua Ni , Yong Ding , Songyuan Dai , Xinran Wang

Benefited from the advantages of light sensitivity of organic materials and high carrier mobility of graphene, organic semiconductor/graphene hybrid phototransistors exhibit ultrahigh photoconductive gain and photoresponsivity, attributed to the carrier multiplication effect in the organic layer. However, with single absorbing layer, the built-in electrical field between organic layer and graphene is insufficient, and spectral response range is limited. In this work, perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) and 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) organic tandem structure with high crystal quality fabricated via van der Waals vapor phase growth is adopted as the light absorbing layer, where suppressed carrier trap states density along with the additional charge-transfer interface between the organic layers result in overall improvement of device performance. Prominent photo-responses are observed with photoresponsivity up to 5.76 × 105A/W and photoconductive gain up to 1.38 × 109. Further more, complementary light absorption spectrum of these two organic materials fulfills effective photodetecting at ultraviolet and visible range.



中文翻译:

有机电荷转移界面增强的石墨烯杂化光电晶体管

得益于有机材料的光敏性和石墨烯的高载流子迁移率,有机半导体/石墨烯混合光电晶体管具有超高的光电导增益和光响应性,这归因于有机层中的载流子倍增效应。然而,对于单吸收层,有机层和石墨烯之间的内置电场不足,并且光谱响应范围受到限制。在这项工作中,per-3,4,9,10-四羧酸二酐(PTCDA)和2,7-二辛基[1]苯并噻吩并[3,2-b] [1]苯并噻吩(C 8-BTBT)通过范德华斯气相生长制造的具有高晶体品质的有机串联结构被用作光吸收层,其中抑制的载流子陷阱态密度以及有机层之间的附加电荷转移界面导致器件的整体改进表现。观察到显着的光响应,光响应高达5.76×10 5 A / W,光导增益高达1.38×10 9。此外,这两种有机材料的互补光吸收光谱可在紫外和可见光范围内实现有效的光检测。

更新日期:2018-10-06
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