標題: Chemically Doped and Cross-linked Hole-Transporting Materials as an Efficient Anode Buffer Layer for Polymer Solar Cells
作者: Sun, Ying
Chien, Shang-Chieh
Yip, Hin-Lap
Zhang, Yong
Chen, Kung-Shih
Zeigler, David F.
Chen, Fang-Chung
Lin, Baoping
Jen, Alex K. -Y.
光電工程學系
顯示科技研究所
Department of Photonics
Institute of Display
關鍵字: hole-transporting materials;cross-linking;PEDOT:PSS;anode buffer layer;doping polymer solar cells
公開日期: 22-十一月-2011
摘要: A series of cross-linkable hole-transporting materials (X-HTMs) consisting of indacenodithiophene, bithiophene, and thiophene units bookended by two triarylamine groups have been designed and synthesized to investigate their suitability as new anode buffer layer for bulk heterojunction polymer solar cells (PSCs). These X-HTMs can be thermally cross-linked at temperature between 150 and 180 C to form robust, solvent-resistant films for subsequent spin-coating of another upper layer. Energy levels of these cross-linked materials were measured by cyclic voltammetry, and the data suggest that these X-HTMs have desirable hole-collecting and electron-blocking abilities to function as an anode buffer layer for PSCs. In addition, by incorporating thiophene or fused ring units into the X-HTM backbone, it effectively improved the hole-carrier motilities. To further improve the conductivity and optical transparency for PSCs, the X-HTM films were p-doped with nitrosonium hexafluoroantimonate (NOSbF(6)). The doped X-HTM layers showed remarkably enhanced hole-current densities compared to neutral X-HTM under the same electric field bias. The properties of the doped X-HTM film as anode buffer layer has been investigated in PSCs. The resulting devices showed similar performance compared to those made using conducting polymer, poly(3,4-ethylene- dioxylenethiophene):poly(styrenesulfonate) (PEDOT:PSS), as the anode buffer layer. Moreover, a novel bilayer HTM structure consisting of a doped and a neutral layer was employed to exploit the feasibility of combining high conductivity from the doped X-HTM and good electron-blocking ability from the neutral X-HTM together. Interestingly, PSC devices based on this bilayer structure showed enhanced V(oc), J(sc), and FF compared to the devices with only a single-layer doped X-HTM. These results indicate that such X-HTMs are promising alternative materials to PEDOT:PSS as an anode buffer layer for polymer solar cells.
URI: http://dx.doi.org/10.1021/cm2024235
http://hdl.handle.net/11536/14647
ISSN: 0897-4756
DOI: 10.1021/cm2024235
期刊: CHEMISTRY OF MATERIALS
Volume: 23
Issue: 22
起始頁: 5006
結束頁: 5015
顯示於類別:期刊論文


文件中的檔案:

  1. 000296893600017.pdf