TY - JOUR
T1 - Triarylene linked spacer effect for dye-sensitized solar cells
AU - Chang, Yuan Jay
AU - Wu, Yu Jane
AU - Chou, Po Ting
AU - Watanabe, Motonori
AU - Chow, Tahsin J.
N1 - Funding Information:
Financial supports from the National Science Council of Taiwan and Academia Sinica are gratefully acknowledged. ( NSC 101-2113-M-029-005-MY2 ). Special thanks to Professor Hsu, C.-P. for assistance on quantum chemistry computations and Professor Sun, S.-S. for electron diffuse lifetime on device at the Institute of Chemistry of Academia Sinica, Taiwan.
PY - 2014/5/2
Y1 - 2014/5/2
N2 - The effect of switching the phenylene and thiophenylene units in the triarylene bridge of organic donor-bridge-acceptor dyads on the performance of dye-sensitized solar cells is investigated. A thiophenylene group displays several distinctive advantages over those of a phenylene group. The electron-donating nature of thiophenlene elevates the electron energy level of the dyads and narrows down the energy gap of the electronic transition, therefore elongates the absorption wavelength. The presence of thiophenylene unit along the bridge also increases the planarity of the molecular geometry, therefore enhances the degree of π-delocalization; however, it also speeds up the rate of charge recombination. The multiple effects of thiophene group along the bridge are examined systematically on two types of dye derivatives, i.e., the T-series and the M-series dyes. Among all the dyes, the ones containing a phenylene-thiophenylene-thiophenylene bridge (T-PSS) showed the highest performance. A typical device made with T-PSS displayed the maximal monochromatic incident photon-to-current conversion efficiency of 65% in the wavelength region between 350 nm and 515 nm, a short-circuit photocurrent density 15.88 mA cm- 2, an open-circuit photovoltage 0.64 V, and a fill factor 0.60, that corresponds to an overall conversion efficiency of 6.13%. The packing order of T-PSS can be further improved by adding deoxycholic acid to an overall conversion efficiency of 6.71%.
AB - The effect of switching the phenylene and thiophenylene units in the triarylene bridge of organic donor-bridge-acceptor dyads on the performance of dye-sensitized solar cells is investigated. A thiophenylene group displays several distinctive advantages over those of a phenylene group. The electron-donating nature of thiophenlene elevates the electron energy level of the dyads and narrows down the energy gap of the electronic transition, therefore elongates the absorption wavelength. The presence of thiophenylene unit along the bridge also increases the planarity of the molecular geometry, therefore enhances the degree of π-delocalization; however, it also speeds up the rate of charge recombination. The multiple effects of thiophene group along the bridge are examined systematically on two types of dye derivatives, i.e., the T-series and the M-series dyes. Among all the dyes, the ones containing a phenylene-thiophenylene-thiophenylene bridge (T-PSS) showed the highest performance. A typical device made with T-PSS displayed the maximal monochromatic incident photon-to-current conversion efficiency of 65% in the wavelength region between 350 nm and 515 nm, a short-circuit photocurrent density 15.88 mA cm- 2, an open-circuit photovoltage 0.64 V, and a fill factor 0.60, that corresponds to an overall conversion efficiency of 6.13%. The packing order of T-PSS can be further improved by adding deoxycholic acid to an overall conversion efficiency of 6.71%.
UR - http://www.scopus.com/inward/record.url?scp=84898815177&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84898815177&partnerID=8YFLogxK
U2 - 10.1016/j.tsf.2014.03.010
DO - 10.1016/j.tsf.2014.03.010
M3 - Article
AN - SCOPUS:84898815177
VL - 558
SP - 330
EP - 336
JO - Thin Solid Films
JF - Thin Solid Films
SN - 0040-6090
ER -