High Open-Circuit Voltage of Organic Bulk Heterojunction Solar Cells Base on Poly(3-hexylthiophene): Fullerene Derivatives

Abstract

Here, we report the fabrication of high efficiency poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PCBM) and [6,6]-diphenyl-C₆₂-bis(butyric acid methyl ester) (bis-PCBM) blended photovoltaic cells. Bulk heterojunction photovoltaic cells with an ITO/G-PH/P3HT:PCBM (or bis-PCBM)/TiO_x/Al configuration were fabricated, and the device using P3HT:bis-PCBM (1:0.7) showed the best performance compared with those using P3HT:PCBM (1:0.7). A maximum power conversion efficiency (PCE) of 4.50% (V_oc = 0.64 V, FF = 0.62) was achieved with P3HT:bis-PCBM (1:0.7).

Keywords:

• Bis-pcbm
• [6,6]-Diphenyl-C₆₂-bis(butyric acid methyl ester)
• open-circuit voltage
• organic bulk heterojunction solar cells

Acknowledgment

This work was supported by the New & Renewable Energy program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant (No. 20103020010050) funded by the Ministry of Knowledge Economy and supported by a grant (M2009010025) from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy (MKE), Republic of Korea.