Efficiency enhancement of organic thin-film phototransistors due to photoassisted charge injection
Efficiency enhancement of organic thin-film phototransistors due to photoassisted charge injection
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DOI：
10.1063/5.0047570
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发表时间：
2021-08
影响因子：
4
通讯作者：
Z. Jagoo;Zachary A. Lamport;O. Jurchescu;L. McNeil
中科院分区：
文献类型：
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作者：
Z. Jagoo;Zachary A. Lamport;O. Jurchescu;L. McNeil
了解有机半导体在光照下的电荷输运的基本物理对于开发新型光电应用是重要的。我们研究了可见光谱中单色光对基于2，8-二氟-5，11-二（三乙基硅基乙炔基）蒽并噻吩的有机薄膜晶体管沟道的影响。当用红光、绿色光或蓝光照射晶体管的沟道时，测量到比仅从光子吸收产生的激子所能提供的更多的电荷载流子，导致光子到电荷载流子的转换效率远大于100%。我们解释了这种现象，使用一个模型，将空间电荷限制的光电荷和增强的空穴注入源电极由于光生电子的势垒降低。
Understanding the underlying physics of charge transport in organic semiconductors under illumination is important for the development of novel optoelectronic applications. We study the effects of monochromatic light in the visible spectrum on the channel of an organic thin-film transistor based on 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene. When the channel of the transistor was illuminated with red, green, or blue light, more charge carriers were measured than what exciton generation from photon absorption alone could provide, leading to a photon-to-charge-carrier conversion efficiency much larger than 100%. We explain this phenomenon using a model incorporating space-charge limited photocharges and enhanced hole injection from the source electrode due to lowering of the potential barrier by photogenerated electrons.