Ha JaeUn, Yoon Seongwon, Lee Jong-Soo, Chung Dae Sung
School of Chemical Engineering and Material Science, Chung-Ang University, Seoul 156-756, Korea.
Nanotechnology. 2016 Mar 4;27(9):095203. doi: 10.1088/0957-4484/27/9/095203. Epub 2016 Jan 29.
In this study, the strategy of using an organic-inorganic hybrid planar heterojunction consisting of polymeric semiconductors and inorganic nanocrystals is introduced to realize a high-performance hybrid photodiode (HPD) with low dark current and high detectivity. To prevent undesired charge injection under the reverse bias condition, which is the major dark current source of the photodiode, a well-defined planar heterojunction is strategically constructed via smart solution process techniques. The optimized HPD renders a low dark current of ∼10(-5) mA cm(-2) at -5 V and ∼10(-6) mA cm(-2) at -1 V, as well as a high detectivity ∼10(12) Jones across the entire visible wavelength range. Furthermore, excellent photocurrent stability is demonstrated under continuous light exposure. We believe that the solution-processed planar heterojunction with inverted structure can be an attractive alternative diode structure for fabricating high-performance HPDs, which usually suffer from high dark current issues.
在本研究中，引入了一种由聚合物半导体和无机纳米晶体组成的有机-无机混合平面异质结策略，以实现具有低暗电流和高探测率的高性能混合光电二极管（HPD）。为了防止在反向偏置条件下产生不期望的电荷注入（这是光电二极管的主要暗电流来源），通过智能溶液处理技术精心构建了明确的平面异质结。优化后的HPD在-5 V时具有约10^(-5) mA cm^(-2)的低暗电流，在-1 V时具有约10^(-6) mA cm^(-2)的低暗电流，并且在整个可见波长范围内具有约10^(12) Jones的高探测率。此外，在连续光照下表现出优异的光电流稳定性。我们认为，具有倒置结构的溶液处理平面异质结可以成为制造高性能HPD的一种有吸引力的替代二极管结构，而高性能HPD通常存在高暗电流问题
