Date
Place
- Room D (Room 322)
- 37. Organic Photovoltaics
- August 20, 2015 (Thursday)
- 15:30 ~ 17:05
- [37-5]
- 16:50 ~ 17:05
- Title:Optical Approach for Efficient Light Trapping in Inverted Polymer Solar Cells
- Raju Lampande, Gyeong Woo Kim, and Jang Hyuk Kwon (Kyung Hee Univ., Korea)
Abstract: In this paper, we report an optical method for light trapping in inverted bulk heterojunction (BHJ)?solar cells. Herein, we incorporated a surface modifying layer in inverted polymer solar cells to improve their electrical performance. A 12% enhancement in power conversion efficiency (PCE) is realized for polymer solar cells with photoactive layer of low bandgap polymer poly[4,8-bis(5-2-ethylhexyl)thiophen-2-yl]benzo[1,2-b;4,5-b¡¯]dithiophene-2,6-diyl-alt-(4-(2-ethylhexyl)-3-fluorothieno[3,4-b]thiophene-)-2-carboxylate-2-6-diyl)](PTB7-Th) and [6,6]-phenyl C71 butyric acid methyl ester (PC70BM). The fabricated inverted polymer solar cell exhibits a maximum PCE as high as 8.60% under simulated 100 mW/cm2 AM 1.5G illumination. The excellent performance of single junction inverted polymer solar cells is attributed to reduction in reflection at the interface. Other reported light trapping approach generally produce charge losses with increasing device resistance resulting in low Fill Factor. Our light trapping approach shows significant improvement in current density of inverted polymer solar cell devices without sacrificing the dark electrical characteristics.
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