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A New Terthiophene‐Thienopyrrolodione Copolymer‐Based Bulk Heterojunction Solar Cell with High Open‐Circuit Voltage
Author(s) -
Jo Jang,
Pron Agnieszka,
Berrouard Philippe,
Leong Wei Lin,
Yuen Jonathan D.,
Moon Ji Sun,
Leclerc Mario,
Heeger Alan J.
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201200350
Subject(s) - terthiophene , materials science , polymer solar cell , open circuit voltage , condensation polymer , polymer , copolymer , solar cell , stille reaction , heterojunction , chemical engineering , polymer chemistry , optoelectronics , voltage , composite material , electrical engineering , engineering
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.