Journal
ORGANIC ELECTRONICS
Volume 38, Issue -, Pages 330-336Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2016.09.003
Keywords
Organic solar cells; Porphyrins; Solution process; High current
Funding
- Ministry of Science and Innovation of Spain [CTQ2013-48252-P]
- Junta de Comunidades de Castilla-La Mancha [PEII-2014-014-P]
- Fundacion Carolina
- ICIQ
- ICREA
- MINECO [CTQ2013-47183r]
- Severo Ochoa Accreditation [SO-2013-0319]
- Robert A. Welch Foundation [AH-0033]
- US National Science Foundation [DMR-1205302]
- ICREA Funding Source: Custom
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1205302] Funding Source: National Science Foundation
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Two new conjugated acceptor-donor-acceptor (A-pi-D-pi-A) molecules with a porphyrin core linked by ethynylene bridges to two thiophene (1a) or thienylenevinylenethiophene (1b) units and both capped by N-ethylrhodanine have been synthesized. These compounds were used as the main electron donor moieties for bulk heterojunction small molecule organic solar cells (BHJ-SMOSC). The optimized devices, with PC71BM as the main electron acceptor molecule, show remarkable short circuit currents, up to 13.2 mA/cm(2), an open circuit voltage of around 0.85 V, and power conversion efficiencies up to 43% under 100 W/cm(2). The External Quantum Efficiency (EQE), Atomic Force Microscopy (AFM), hole mobility, Photo-Induced Charge Extraction (PICE) and Photo-Induced Transient Photo-Voltage (PIT-PV) were analyzed in devices based on 1a and 1b in order to account for differences in the final performance of the two molecules. The PIT-PV decays showed slower recombination kinetics for devices fabricated with 1b. Moreover, the EQE was greater for 1b and this is ascribed to the better nanomorphology, which allows better charge collection before carrier recombination takes place. (C) 2016 Elsevier B.V. All rights reserved.
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