|Alternative Title||Near Infrared Photoresponsive Organic Field-effect Transistor by Utilizing Pentacene/PbPc Heterojunction
|Place of Conferral||兰州
|Abstract||有机光敏场效应晶体管（photoresponsive organic field-effect transistor，photOFET）作为一种新型的光电探测器，由于具有低成本、易大面积制备和柔性等特点而受到广泛的关注。目前photOFET一般采用单层结构或者由两种不同导电类型材料构成的异型异质结制备，而采用两种相同导电类型材料构成的同型异质结器件的报道较少。本论文中采用并五苯（pentacene）和酞菁铅（PbPc）两种p型有机材料，制备了同型异质结的近红外photOFET，并与基于C60和酞菁铅的异型异质结photOFET进行了对比研究。
|Other Abstract||Photoresponsive organic field-effect transistor (photOFET) as a new type of photodetector have attractted more and more attention attributed to low cost, easy preparation of large-area film, flexible and other features. At present, most photOFET are fabricated by utilizing single active layer or anisotype heterojunction which consists of two semiconductors with dissimilar type of conductivity. Yet the isotype heterojunction, which consisted of two semiconductor materials with same type of conductivity, is rarely studied and applied in the field of photOFET. In this dissertation, near infrared photOFET achieved by organic isotype heterojunction based on pentacene and lead phthalocyanine (PbPc) were fabricated. And we have compared the performances of the isotype heterojunction photOFET (iso-photOFET) and the anisotype heterojunction photOFET (aniso-photOFET) based on C60 and PbPc.
1. The single-layer photOFET based on pentacene or PbPc were prepared, and the effects of different source/drain electrode materials (Au or Ag) on the device performances were investigated. It was proved that the pentacene has excellent hole-transport ability and PbPc has high near-infrared light absorption coefficiant. The Ohmic contact at the interface between Au electrodes and PbPc or pentacene active layer could effectively increase the field-effect mobility of the single-layer photOFET.
2. The photosensitive performances of p-P isotype heterojunction photOFET with different electrode materials was studied. The results indicated that the photosensitive performance of p-P iso-photOFET was much better than that of PbPc single-layer photOFET, and the photosensitive properties were improved by the schottky contact between silver electrodes and PbPc layer. Additionally, the effects of pentacene layer’s thickness on the photosensitive properties of p-P iso-photOFET were investigated, and the optimized thickness of pentacene transport layer in iso-photOFET was obtained.
3. Comparing to the photOFET with C60/PbPc anisotype heterojunction, the p-P iso-photOFET could achieve good field-effect characteristics and superior photosensitive performances as well as better stability.|
周茂清. 基于并五苯/酞菁铅异质结的近红外光敏有机场效应晶体管[D]. 兰州. 兰州大学,2014.
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