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http://dx.doi.org/10.1016/j.jiec.2013.04.037

Open circuit voltage increase by substituted spacer and thieno[3,4-c]pyrrole-4,6-dione for polymer solar cells  

Song, Kwan Wook (Department of Materials Chemistry and Engineering, Konkuk University)
Choi, Min Hee (Department of Materials Chemistry and Engineering, Konkuk University)
Han, Myung Hee (Department of Materials Chemistry and Engineering, Konkuk University)
Moon, Doo Kyung (Department of Materials Chemistry and Engineering, Konkuk University)
Publication Information
Journal of Industrial and Engineering Chemistry / v.20, no.2, 2014 , pp. 426-434 More about this Journal
Abstract
We reported on two donor polymers containing thieno[3,4-c]pyrrole-4,6-dione(TPD) derivatives as electron withdrawing units for organic photovoltaics (OPVs). To control molecular weight and solubility of polymers, hexyl side chains are inserted to thiophene spacers. Due to the electron donating characteristic of hexyl side chains, highest occupied molecular orbital (HOMO) energy level of polymer is decreased as 0.18 eV, whereas the open circuit voltage is increased to 1.08 V. When bulk heterojunction devices were fabricated, the best PCE value of 0.360% ($V_{OC}$ = 0.89 V, $J_{SC}=1.2mA/cm^2$, FF = 36.3%) under $100mW/cm^2$ irradiation.
Keywords
Organic photovoltaics (OPVs); Thieno[3,4-c]pyrrole-4,6-dione(TPD); Electron donating characteristic;
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