標題: Interfacial Engineering with Cross-Linkable Fullerene Derivatives for High-Performance Perovskite Solar Cells
作者: Kang, Tin
Tsai, Cheng-Min
Jiang, Yu-He
Gollavelli, Ganesh
Mohanta, Nayantara
Diau, Eric Wei-Guang
Hsu, Chain-Shu
應用化學系
應用化學系分子科學碩博班
Department of Applied Chemistry
Institute of Molecular science
關鍵字: cross-linkable fullerene;ETL;electrochemical impedance spectroscopy;interfacial layer;photoluminescence decay;PSC;titanium oxide
公開日期: 8-Nov-2017
摘要: Two fullerene derivatives with styryl and oxetane cross-linking groups served as interfacial materials to modify an electron-transporting layer (ETL) of TiO2, doped with Au nanoparticles, processed under low-temperature conditions to improve the performance of perovskite solar cells (PSC). The cross-linkable [6,6]-phenyl-C-61-butyric styryl dendron ester was produced via thermal treatment at 160 degrees C for 20 min, whereas the cross-linkable [6,6]-phenyl-C-61-butyric oxetane dendron ester (C-PCBOD) was obtained via UV-curing treatment for 45 s. Both cross-linked fullerenes can passivate surface-trap states of TiO2 and have also excellent surface coverage on the TiO2 layer shown in the corresponding atomic force microscopy images. To improve the crystallinity of perovskite, we propose a simple co-solvent method involving mixing dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) in a specific ratio (DMF/DMSO = 90/10). The fullerene derivative layer between the ETL and perovskite layers significantly improved electron extraction and suppressed charge recombination by decreasing the density of traps at the ETL surface. A planar PSC device was fabricated with the configuration indium tin oxide/TiO2 (Au)/C-PCBOD/perovskite/spiro-OMeTAD/Au to attain a power conversion efficiency (PCE) of 15.9%. The device performance was optimized with C-PCBOD as an interfacial mediate to modify the surface of the mesoporous TiO2 ETL; the C-PCBOD-treated device attained a significantly enhanced performance, PCE 18.3%. Electrochemical impedance spectral and photoluminescence decay measurements were carried out to understand the characteristics of electron transfer and charge recombination of the perovskite/TiO2 samples with and without a fullerene interfacial layer.
URI: http://dx.doi.org/10.1021/acsami.7b11795
http://hdl.handle.net/11536/144084
ISSN: 1944-8244
DOI: 10.1021/acsami.7b11795
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 9
起始頁: 38530
結束頁: 38536
Appears in Collections:Articles