Universal Efficiency Improvement in Organic Solar Cells Based on a Poly(3‐hexylthiophene) Donor and an Indene‐C60 Bisadduct Acceptor with Additional Donor Nanowires. Issue 6 (11th March 2015)

• Record Type: Journal Article
• Authors: Joe, Sung‐yoon; Yim, Jong Hyuk; Ryu, Shin Young; Ha, Na Young; Ahn, Yeong Hwan; Park, Ji‐Yong; Lee, Soonil
• Is Part Of: Chemphyschem. Volume 16:Issue 6(2015)
• Page Start: 1217
• Page End: 1222
• Publication Date: 2015-03-11
• Subjects: donor–acceptor systems -- energy conversion -- nanowires -- organic solar cells -- quantum efficiency; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201402762
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: With poly(3‐hexylthiophene) (P3HT) nanowire (NW) inclusion in active layers (ALs), organic solar cells (OSCs) based on P3HT donor and indene‐C60 bisadduct (ICBA) acceptor showed power conversion efficiency ( PCE ) improvements for both bulk heterojunction (BHJ)‐ and bilayer (BL)‐structure AL devices. The PCE increase was approximately 14 % for both types of P3HT:ICBA OSCs. However, improvements in short‐circuit current density ( J sc ) were about 4.4 and 6.4 % for BHJ‐ and BL‐type AL devices, respectively. A systematic study showed that the addition of P3HT NWs did not result in enhanced internal quantum efficiencies for either type of device. However, the difference in light‐harvesting efficiency was important in accounting for J sc variations. Interestingly, there was no correlation between J sc and PCE variations, whereas the open‐circuit voltage ( V oc ) and fill factor ( FF ) showed correlations with the PCE . The variation in FF is discussed in terms of V oc and equivalent‐circuit parameters based on a nonideal diode model. Abstract : Energy efficiency: Preformed poly(3‐hexylthiophene) (P3HT) nanowires (NWs) added to active layers of organic solar cells based on the P3HT–indene‐C60 bisadduct (ICBA) donor–acceptor pair result in improved power conversion efficiencies for both bulk heterojunction‐ and bilayer‐type devices. The differences in the light‐harvesting efficiencies account for variations in the short‐circuit current density.