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- W2770115213 abstract "Abstract Small molecule donor materials with varied number of fluorine atoms (zero and four for ICT7 and ICT9 , respectively) are synthesized and the influence of the fluorine atom content on their photophysical, electrochemical and thermal properties is studied. With an increase in the number of F atoms, the absorption maximum of the donor material is blue shifted with an increase in the molar extinction coefficient and also, the HOMO (−5.60 and −5.70 eV, respectively, for ICT7 and ICT9 ) and the LUMO (−3.70 and −3.76 eV, respectively, for ICT7 and ICT9 ) energy levels are stabilized. Thermal properties, such as melting temperature T m (223 and 312 °C, respectively, for ICT7 and ICT9 ) and crystallization temperature T c (174 and 284 °C, respectively, for ICT7 and ICT9 ) are significantly enhanced with increasing numbers of fluorine atoms. Solution‐processed bulk heterojunction solar cells (BHJSCs) are fabricated using these two donors along with PC 71 BM as the acceptor. Under the optimized conditions, they exhibited an overall power conversion efficiency (PCE) of 6.43 % and 8.34 % for ICT7 :PC 71 BM and ICT9 :PC 71 BM active layers, respectively. ICT9 with four F atoms induced a better nanoscale morphology to the active layer, exhibited efficient charge transport and exciton dissociation and resulted in a better PCE of the BHJSCs." @default.
- W2770115213 created "2017-12-04" @default.
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- W2770115213 date "2017-12-12" @default.
- W2770115213 modified "2023-10-16" @default.
- W2770115213 title "Optimization of the Donor Material Structure and Processing Conditions to Obtain Efficient Small-Molecule Donors for Bulk Heterojunction Solar Cells" @default.
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- W2770115213 doi "https://doi.org/10.1002/cptc.201700170" @default.
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