A New Terthiophene‐Thienopyrrolodione Copolymer‐Based Bulk Heterojunction Solar Cell with High Open‐Circuit Voltage |
| |
| Authors: | Jang Jo Agnieszka Pron Philippe Berrouard Wei Lin Leong Jonathan D. Yuen Ji Sun Moon Mario Leclerc Alan J. Heeger |
| |
| Affiliation: | 1. Center for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, CA 93106‐5090, USA;2. Department of Chemistry, Université Laval, Quebec City, QC, G1V 0A6, Canada |
| |
| Abstract: | A new semiconducting polymer based on terthiophene‐thienopyrrolodione alternating building blocks with a deep HOMO energy level (5.66 eV) is presented. The polymer is prepared by a direct heteroarylation polycondensation reaction, which is a low‐cost and green alternative to the standard Stille coupling reaction and thus avoids any use of toxic stannyl derivatives. Integrating the polymer into bulk heterojunction solar cells with [6,6]‐phenyl C71‐butyric acid methyl ester ([70]PCBM) leads to a PCE of over 6% and a high open‐circuit voltage of up to 0.94 V. To obtain these results a unique processing additive, 1‐chloronaphthalene, is used, and a relatively low concentration of [70]PCBM is used in the blend solution. |
| |
| Keywords: | BHJ solar cells chloronaphthalene direct heteroarylation open‐circuit voltages TPD |
|
|
