Srivastava Shashi Bhushan, Melikov Rustamzhon, Yildiz Erdost, Han Mertcan, Sahin Afsun, Nizamoglu Sedat
Department of Electrical and Electronics Engineering, Koc University, Istanbul 34450, Turkey.
Koc University Research Center for Translational Medicine, Koc University, Istanbul 34450, Turkey.
Biomed Opt Express. 2020 Aug 25;11(9):5237-5248. doi: 10.1364/BOE.396068. eCollection 2020 Sep 1.
Optoelectronic photoelectrodes based on capacitive charge-transfer offer an attractive route to develop safe and effective neuromodulators. Here, we demonstrate efficient optoelectronic photoelectrodes that are based on the incorporation of quantum dots (QDs) into poly(3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-Phenyl-C61-butyric acid methyl ester (PCBM) bulk heterojunction. We control the performance of the photoelectrode by the blend ratio, thickness, and nanomorphology of the ternary bulk heterojunction. The optimization led to a photocapacitor that has a photovoltage of 450 mV under a light intensity level of 20 mW.cm and a responsivity of 99 mA/W corresponding to the most light-sensitive organic photoelectrode reported to date. The photocapacitor can facilitate action potential generation by hippocampal neurons via burst waveforms at an intensity level of 20 mW.cm. Therefore, the results point to an alternative direction in the engineering of safe and ultra-light-sensitive neural interfaces.
基于电容性电荷转移的光电电极提供了一条开发安全有效的神经调节装置的诱人途径。在此，我们展示了一种高效的光电电极，它是基于将量子点（QD）掺入聚（3-己基噻吩-2,5-二亚基）（P3HT）和[6,6]-苯基-C61-丁酸甲酯（PCBM）本体异质结中制成的。我们通过三元本体异质结的混合比例、厚度和纳米形态来控制光电极的性能。这种优化产生了一种光电容器，在光强度为20 mW·cm²时具有450 mV的光电压和99 mA/W的响应度，这与迄今为止报道的最光敏有机光电极相对应。该光电容器能够通过强度为20 mW·cm²的突发波形促进海马神经元产生动作电位。因此，这些结果为安全且超光敏神经接口的工程设计指出了一个新的方向。
