کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1441514 | 1509409 | 2013 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrical and photoelectrical properties of polymer single nanowire made of diketopyrrolopyrrole-based conjugated copolymer bearing dithieno[3,2-b:2′,3′-d]thiophene Electrical and photoelectrical properties of polymer single nanowire made of diketopyrrolopyrrole-based conjugated copolymer bearing dithieno[3,2-b:2′,3′-d]thiophene](/preview/png/1441514.png)
We demonstrated a diketopyrrolopyrrole (DPP)-based alternating copolymer (i.e., PDTTDPP) which contains planar dithieno[3,2-b:2′,3′-d]thiophene (DTT) unit and high effectiveness in the fabrication of solution-based polymer nanowires (PNWs). PDTTDPP was found highly crystalline and exhibited optimized energy levels for p-type semiconductor. The electrical properties of single PNWs such as specific resistivity (ρ) and photoresponsivity (R) were investigated by measuring the dark current and photocurrent under visible and near-infrared lights. These electrical properties were compared for high (HA-PNW) and low (LA-PNW) aspect ratio PNWs produced using two different preparation methods such as membrane wetting method and self-assembly in a dilute solution. The measured responsivity (R) values of single HA-PNW at +40 V are 134 and 114 A W−1 at 632 and 830 nm, respectively. In contrast, the R values of LA-PNW under identical conditions were determined to range from 0.55 A W−1 to 0.65 A W−1 (λ = 632 nm) and from 0.61 A W−1 to 0.73 A W−1 (λ = 830 nm) at a +40 V bias voltage, which are significantly lower than those of HA-PNW-based devices.
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► Photoresponsive conjugated polymer was demonstrated.
► Polymer nanowires were fabricated.
► Electrical properties of polymer nanowires were investigated.
► Polymer nanowire with higher aspect ratio showed higher photoresponsivity.
Journal: Synthetic Metals - Volume 167, 1 March 2013, Pages 37–42