期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002355
关键词
antisolvents; coordination polymers; copper(I) thiocyanate; diethyl sulfide; hole transport
类别
资金
- Vidyasirimedhi Institute of Science and Technology (VISTEC)
- VISTEC's Frontier Research Center (FRC)
- Thailand's Synchrotron Light Research Institute (SLRI) [TRG6280013]
- Thailand Research Fund (TRF) [TRG6280013]
- VISTEC
- iCeMS
- KAKENHI from Japan Society for the Promotion of Science (JSPS) [JP16H02285]
- Japan Synchrotron Radiation Research Institute (JASRI) [2019A1765]
Copper(I) thiocyanate (CuSCN) is rising to prominence as a hole-transporting semiconductor in various opto/electronic applications. Its unique combination of good hole mobility, high optical transparency, and solution-processability renders it a promising hole-transport layer for solar cells andp-type channel in thin-film transistors. CuSCN is typically deposited from sulfide-based solutions with diethyl sulfide (DES) being the most widely used. However, little is known regarding the effects of DES on CuSCN films despite the fact that DES can coordinate with Cu(I) and result in a different coordination polymer having a distinct crystal structure when fully coordinated. Herein, the coordination of DES in CuSCN films is thoroughly investigated with a suite of characterization techniques as well as density functional theory. This study reveals that DES directly affects the microstructure of CuSCN by stabilizing the polar crystalline surfaces via the formation of strong coordination bonds. Furthermore, a simple antisolvent treatment is demonstrated to be effective at modifying the microstructure and morphology of CuSCN films. The treatment with tetrahydrofuran or acetone leads to uniform films consisting of CuSCN crystallites with high crystallinity and their surfaces passivated by DES molecules, resulting in an increase in the hole mobility from 0.01 to 0.05 cm(2)V(-1)s(-1).
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