Rate-determining process in MISIM photocells for optoelectronic conversion using photo-induced pure polarization current without carrier transfer across interfaces.
Rate-determining process in MISIM photocells for optoelectronic conversion using photo-induced pure polarization current without carrier transfer across interfaces.
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DOI：
10.1039/c9cp01221d
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
Akihiro Tomimatsu;S. Yokokura;L. Reissig;S. Dalgleish;M. Matsushita;K. Awaga
中科院分区：
文献类型：
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作者：
Akihiro Tomimatsu;S. Yokokura;L. Reissig;S. Dalgleish;M. Matsushita;K. Awaga
最近，我们提出了一种[金属|绝缘体|半导体|绝缘体|金属]（MISIM）光电池，作为一种新的架构，高速有机光电探测器。调制光照射引起的S层中的电极化作为极化电流通过I层传播到外部电路中，而没有任何载流子跨界面转移。在目前的工作中，我们研究了MISIM光电池组成的锌酞菁（ZnPc）-C60双层的S层和聚对二甲苯C的两个I层，了解MISIM光电池的基本方面，如电流极性和调制频率的依赖性。有人发现，在这样的设备中，电流极性主要由S层中的极化决定，这是由照射时的施主-受主电荷转移引起的。此外，ON和OFF电流，这出现在照明开和关的时期，分别表现出显着不同的调制频率的依赖性。这是很好的解释之间的不平衡的快速偏振的S层在照明和它的缓慢松弛在黑暗中。
Recently, we proposed a [metal|insulator|semiconductor|insulator|metal] (MISIM) photocell, as a novel architecture for high-speed organic photodetectors. The electric polarization in the S layer, induced by modulated light illumination, propagates into the outside circuit as a polarization current through the I layers, without any carrier transfer across the interfaces. In the present work, we examined the MISIM photocells consisting of zinc-phthalocyanine(ZnPc)-C60 bilayers for the S layer and Parylene C for the two I layers, to understand the fundamental aspects of the MISIM photocells, such as current polarity and modulation-frequency dependence. It was found that, in such devices, the current polarity was primarily determined by the polarization in the S layer, which was induced by the donor-acceptor charge-transfer upon illumination. Furthermore, the ON and OFF current, which appeared in the periods of illumination-on and -off, respectively, exhibited significantly different dependence on the modulation frequency. This was well-explained by an imbalance between a quick polarization in the S layer during illumination and its slow relaxation in the dark.