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Enhanced Performance and Stability of Polymer BHJ Photovoltaic Devices from Dry Transfer of PEDOT:PSS
Author(s) -
Kim Jung Kyu,
Park Insun,
Kim Wanjung,
Wang Dong Hwan,
Choi DaeGeun,
Choi Yeong Suk,
Park Jong Hyeok
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201400022
Subject(s) - pedot:pss , materials science , indium tin oxide , substrate (aquarium) , chemical engineering , layer (electronics) , polymer , wafer , polymer solar cell , nanotechnology , composite material , oceanography , engineering , geology
Polymer solar cells with enhanced initial cell performances and long‐term stability were fabricated by performing a simple dry transfer of a hole extraction layer [poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)] onto an indium tin oxide (ITO) substrate. Due to the very flat surface of the polyurethane acrylate/polycarbonate (PUA/PC) film, which was used as a mold and resembled the surface of the original substrate (silicon wafer), the transferred layer had a very smooth surface morphology, resulting in enhancement of the interfacial characteristics. The work function of the PEDOT:PSS layer and the morphology of bulk hetero junction (BHJ) layer were tuned by controlling the position of PSS enrichment in the PEDOT:PSS layer using the dry transfer. The power conversion efficiency of PTB7:PC 71 BM BHJ device prepared by the dry transfer was 8.06 %, which was significantly higher than that of the spin‐cast device (7.32 %). By avoiding direct contact between the ITO substrate and the PEDOT:PSS solution in the dry transfer system, etching and diffusion of indium in the ITO substrate were greatly reduced, thereby improving the stability.