Citation:
Shuai Zhang, Hongfei Qu, Lu Zhang, Xingchao Zhao, Luxin Zhang, Yao Ma, Liang Shen, Xiaoling Ma, Fujun Zhang. 通过调整电荷注入方向实现的绿色/红色双模式倍增型有机光电探测器[J]. Acta Physico-Chimica Sinica,
;2026, 42(11): 100253.
doi:
10.1016/j.actphy.2026.100253
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我们制备了一系列poly (9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT):poly [4,8-bis(5-(2-ethylhexyl) thiophen-2-yl)benzo[1,2-b;4,5-b']dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno [3,4-b] thiophene-)-2-carboxylate-2-6-diyl] (PTB7-Th) (3 : 1, w/w)/Glass/indium tin oxide (ITO)/poly[(9,9-bis(3'-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-5,5'-bis(2,2'-thiophene)-2,6-naphthalene-1,4,5,8-tetracaboxylic-N,N'-di(2-ethylhexyl)imide] (PNDIT-F3N)/poly(3-hexylthiophene) (P3HT):[6,6]-phenylC71-butyric acid methyl ester (PC71BM) (100 : 1, w/w)/Aluminum (Al)结构的双模式倍增型有机光电探测器(PMOPDs)。外部F8BT:PTB7-Th层用作有机滤光层(OFL)来调节PMOPDs中的光场分布。在正反向偏压下的PMOPDs可以实现双窄带特性,这是由ITO和Al电极附近的受陷电子分布分别决定的。在8 V偏压下,PMOPDs表现出绿色窄带响应,半峰全宽(FWHM)为85 nm,545 nm处的峰值外量子效率(EQE)为8880%。同时,在-8 V偏压下,PMOPDs表现出红色窄带响应,FWHM为60 nm,峰值EQE为750%。正向偏压下ITO电极附近的受陷电子分布和反向偏压下Al电极附近的受陷电子分布可以很好地解释PMOPDs的可切换窄带响应特性。我们利用最优的双模式PMOPDs构建了光电容积脉搏波(PPG)测量系统,成功监测了人体在不同状态下的心率。从原始的PPG信号中获得了速率容积脉搏波与加速度容积脉搏波信号,可以用来估计人体动脉的硬化程度,为血管疾病的诊断提供依据。
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