Characterization and field-effect transistor performance of printed pentacene films prepared by photoconversion of a soluble precursor
Characterization and field-effect transistor performance of printed pentacene films prepared by photoconversion of a soluble precursor
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DOI：
10.1039/c3tc31083c
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发表时间：
2013-09
影响因子：
6.4
通讯作者：
K. Nakayama;Chika Ohashi;Yoshisato Oikawa;Takao Motoyama;H. Yamada
中科院分区：
文献类型：
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作者：
K. Nakayama;Chika Ohashi;Yoshisato Oikawa;Takao Motoyama;H. Yamada
6,13-二氢-6,13-乙炔戊二烯-15,16-二酮是可溶的并五烯前体，在固态下辐照可转化为并五烯。利用紫外可见吸收光谱和红外光谱对其在旋涂膜中的光转化过程进行了监测。在氯仿旋转镀膜溶液中加入少量高沸点添加剂，促进光转化，获得适合于fet的高质量薄膜。FET的迁移率与添加剂的沸点和溶解能力相关，表明在光转化过程中保持半干燥状态对完全光转化至关重要。优化了光辐照条件（辐照强度、持续时间和衬底温度），获得了0.86 cm2 V−1 s−1的场效应迁移率，与真空沉积并五苯薄膜的性能相当。所制备的薄膜具有不同于真空沉积薄膜的部分结晶形态。光电转换薄膜的高场效应晶体管迁移率归因于部分结晶度引起的连续连接的晶界。
6,13-Dihydro-6,13-ethanopentacene-15,16-dione is a soluble precursor of pentacene, which can be converted into pentacene by irradiation in the solid-state. Its photoconversion process in spin-coated films was monitored by UV-visible absorption and IR spectroscopy. A small amount of high-boiling-point additives in the chloroform spin-coating solution promoted photoconversion to obtain high quality films suitable for FETs. The FET mobilities showed a correlation with the additives' boiling points and dissolution abilities, indicating that the retainment of a semidry state during photoconversion is essential to the complete photoconversion. Photoirradiation conditions (irradiation intensity, duration and substrate temperature) were optimized to achieve a field-effect mobility of 0.86 cm2 V−1 s−1, comparable to the performance of vacuum-deposited pentacene films. The prepared films have a partially crystalline morphology different from that of vacuum-deposited films. The high FET mobility of the photoconverted film is attributed to continuously connected grain boundaries arising from partial crystallinity.