Bulk- and layer-heterojunction phototransistors based on poly [2-methoxy-5-(2′-ethylhexyloxy-p-phenylenevinylene)] and PbS quantum dot hybrids
Bulk- and layer-heterojunction phototransistors based on poly [2-methoxy-5-(2′-ethylhexyloxy-p-phenylenevinylene)] and PbS quantum dot hybrids
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DOI：
10.1063/1.4922917
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发表时间：
2015-06
影响因子：
4
通讯作者：
Xiaoxian Song;Yating Zhang;Ran Wang;Mingxuan Cao;Yongli Che;Jianlong Wang;Haiyan Wang;Lufan Jin;H. Dai;X. Ding;Guizhong Zhang;Jianquan Yao
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文献类型：
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作者：
Xiaoxian Song;Yating Zhang;Ran Wang;Mingxuan Cao;Yongli Che;Jianlong Wang;Haiyan Wang;Lufan Jin;H. Dai;X. Ding;Guizhong Zhang;Jianquan Yao
薄膜光电探测器的响应率R与其光致载流子密度n与迁移率μ成正比。然而，当在层异质结（LH）和体异质结（BH）场效应光电晶体管（FEpTs）之间进行选择时，两种器件结构中哪一种更有利于光探测尚不清楚。对聚合物量子点和PbS量子点杂化结构进行了比较研究。两种器件均表现出双极性行为，BH-FEpTs的μE≈μH = 3.7 cm2 V−1 s−1，lb - fepts的μH = 36 cm2 V−1 s−1和μE = 52 cm2 V−1 s−1。由于μ和通道阶度（α）的改善，在相同条件下，h - fepts的响应率高达101 A/W，比BH-FEpTs的响应率（10−1A/W）提高了两个数量级。虽然BH- fept中较大的面积提高了激子分离度（β）和n，但缺乏有效的输运机制成为制约其高纯度的主要因素。
The responsivity (R) of a thin film photodetector is proportional to the product of its photo-induced carrier density (n) and mobility (μ). However, when choosing between layer heterojunction (LH) and bulk heterojunction (BH) field-effect phototransistors (FEpTs), it is still unclear which of the two device structures is more conducive to photodetection. A comparison study is performed on the two structures based on polymer and PbS quantum dot hybrids. Both devices exhibit ambipolar behavior, with μE ≈ μH = 3.7 cm2 V−1 s−1 for BH-FEpTs and μH = 36 cm2 V−1 s−1 and μE = 52 cm2 V−1 s−1 for LH-FEpTs. Because of the improvements in μ and the channel order degree (α), the responsivity of LH-FEpTs is as high as 101 A/W, which is as much as two orders of magnitude higher than that of BH-FEpTs (10−1A/W) under the same conditions. Although the large area of the BH improves both the exciton separation degree (β) and n in the BH-FEpT, the lack of an effective transport mechanism becomes the main constraint on high de...