Citation: Zhong Wen-kai, Xie Rui-hao, Ying Lei, Huang Fei, Cao Yong. High Performance Polymer Photodetectors Enabled by a Naphtho[1, 2-c: 5, 6-c']bis([1, 2, 5]thiadiazole) Based π-Conjugated Polymer[J]. Acta Polymerica Sinica, ;2018, (2): 217-222. doi: 10.11777/j.issn1000-3304.2018.17242 shu

High Performance Polymer Photodetectors Enabled by a Naphtho[1, 2-c: 5, 6-c']bis([1, 2, 5]thiadiazole) Based π-Conjugated Polymer

Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640

Corresponding author: Ying Lei, msleiying@scut.edu.cn Huang Fei, msleiying@scut.edu.cn
Received Date: 28 August 2017
Revised Date: 13 September 2017

Naphtho[1, 2-c:5, 6-c']bis([1, 2, 5]thiadiazole) (NT) unit with centro-symmetric and enlarged planar π-conjugated structure is one of the most promising electron-withdrawing moieties for the construction of high-performance conjugated polymers for solar cells and organic field-effect transistors. Recently, an NT based narrow-bandgap conjugated polymer (NTOD), consisting of NT as the electron-withdrawing unit and 2, 5-bis(3-alkylthiophen-2-yl)thieno[3, 2-b]thiophene as the electron-donating unit, has been developed, which exhibited a remarkable power conversion efficiency exceeding 10% and might be used to construct device with thick active layer over 300 nm. Considering the impressive photovoltaic performances achieved based on the NT-polymers, here we designed and fabricated solution-processed polymer photodetectors using NTOD as the electron donor. Device with architecture of ITO/PEDOT:PSS/active layer/Al was fabricated to investigate the performance of the photodetector. The active layer was comprised of NTOD as the electron donor and a fullerene derivative of (6, 6)-phenyl-C71-butyric acid methyl ester (PC₇₁BM) as the electron acceptor, which displayed broad absorption spectra ranging from 400 nm to 830 nm. We noted that the dark current density of the photodetectors was effectively suppressed by increasing the thickness of the NTOD:PC₇₁BM based active layer, while the external quantum efficiency (EQE) of the devices maintained relatively high. It is also worth pointing out that, when the thickness of the active layer increased up to 385 nm, the device exhibited low dark current density of 6.69×10^-10 A cm-2 at -0.1 V, for which the specific detectivity (D^*) is higher than 10¹³ cm Hz^1/2 W^-1 in the range of 440-800 nm, with champion detectivity of 1.50×10¹³ cm Hz^1/2 W^-1 and responsivity of 0.22 A W-1 at 750 nm. Moreover, the polymer photodetector exhibited a high detectivity of 1.10×10¹³ cm Hz^1/2 W^-1 at 800 nm, suggesting the good detectivity extending to near-infrared (NIR) region. These results indicate that the NTOD polymer has great potential for the construction of high performance polymer photodetectors.
- Naphtho[1, 2-c:5, 6-c']bis ([1, 2, 5]thiadiazole),
- Conjugated polymers,
- Narrow bandgap,
- Polymer photodetector
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

High Performance Polymer Photodetectors Enabled by a Naphtho[1, 2-c: 5, 6-c']bis([1, 2, 5]thiadiazole) Based π-Conjugated Polymer

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com