氧敏感性供体-受体共轭聚合物薄膜晶体管

Oxygen Sensing Characteristics of Donor-acceptor Conjugated Polymer Transistors of Organic Semiconductor Film

研究了基于供体-受体共轭聚合物双(2-氧代二氢吲哚-3-亚基)-苯并二呋喃-二酮和联噻吩(PBIBDF-BT)薄膜晶体管的氧传感特性。在不同的氧气浓度下,器件展示了空穴和电子载流子的传感特性,如源漏电流、迁移率和亚阈值摆幅随着氧从半导体层内吸附/解吸附的过程中被调节。实验结果表明:随着真空度从0.7 Pa上升到0.08Pa,即氧气的体积分数从~5.3×10^(-6)降到~6×10^(-7),对于P型传输的迁移率、源漏电流(开态)和亚阈值摆幅分别改变了-52.7%、-51.3%和48%,而对于N型传输分别改变了42.3%、59.5%和-39%。并且腔室中氧气的浓度从~8×10^(-7)降到~6×10^(-7),变化了~2×10^(-7),相应的P型和N型源漏电流分别变化了-45.9%和31.1%。基于PBIBDF-BT聚合物薄膜晶体管能够实现对氧气的双极性检测和低的氧检测线。

The oxygen sensing transistor characteristics of a conjugated polymer based on bis（ 2-oxoindolin-3-ylidene）-benzodifuran-dione and bithiophene（ PBIBDF-BT） were investigated. The devices depicted both hole-and electron-carriers transport sensing properties in different oxygen atmospheres,where characteristics like drain current,mobility（ μ） and subthreshold swing（ SS） were tuned through the absorption/desorption processes of oxygen into the semiconductor layers. Experimental results indicate that the drain current,μ and SS based on the PBIBDF-BT polymer TFTs changed by-52. 7%,-51. 3%and 48% for P-channel,while changed by 42. 3%,59. 5% and-39% for N-channel as the vacuum from 0. 7 Pa（ oxygen volumn fraction ~ 5. 3 × 10-6） to 0.08 Pa（ oxygen volumn fraction ~ 6 ×10-7）.As the oxygen volumn fraction decreases from ~ 8 × 10-7 to ~ 6 × 10-7,the drain current of P-channel and N-channel increased by-45. 9% and 31. 1%,respectively. PBIBDF-BT polymer TFTs show bipolar detection of oxygen,and has a low oxygen detection line.