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Proceedings Paper

Over 11%-efficiency fullerene-free organic solar cells enabled by benign solvents (Conference Presentation)
Author(s): Long Ye; Wenchao Zhao; Masoud Ghasemi; Yuan Xiong; Jianhui Hou; Harald W. Ade

Paper Abstract

Owing to the recently developed nonfullerene small molecule acceptors, the best power conversion efficiency (PCE) of solution-processable organic solar cells (OSCs) has been boosted up to over 12%[1], which makes this technology an economically viable contender for commercialization. Along with the steady progress in PCE achieved by spin-coating photovoltaic materials with chlorinated solvents in protective atmosphere, a central issue in the development of OSCs is pursuing a greener and simpler manufacturing protocol[2], which particularly allows for large-area processing in ambient air. Particularly, it is still a great challenge to replace halogenated solvents with halogen-free, low-toxicity solvents to achieve high-efficiency nonfullerene OSCs. Here we show that ~11.6% efficiency is achieved in nonfullerene OSC device based on PBDB-T:IT-M[3] by using a non-halogenated solvent combination. Moreover, the device parameters were correlated to the morphology investigated by synchrotron radiation grazing-incidence wide-angle X-ray scattering (GIWAXS), resonant soft X-ray scattering (R-SoXS), and differential scanning calorimetry (DSC). We observed a monotonic correlation between the average composition variations and photovoltaic device characteristics across all processing protocols in this record-efficiency material system. This correlation is indeed universal for OSC, irrespective of acceptor materials used (fullerenes, nonfullerene molecular acceptor, or conjugated polymers) and fabrication methods used (spin-coating or blade-coating).[1-5] We believe this nonhazardous solvent approach will be also applicable in the large area roll-to-roll coating and industrial scale printing of high-efficiency OSCs in air. Reference [1] Li, S.; Ye, L.; Zhao, W.; Zhang, S.; Mukherjee, S.; Ade, H.; Hou, J., Energy-Level Modulation of Small-Molecule Electron Acceptors to Achieve over 12% Efficiency in Polymer Solar Cells. Adv. Mater. 2016, 28 (42), 9423-9429. [2] Ye, L.; Xiong, Y.; Yao, H.; Gadisa, A.; Zhang, H.; Li, S.; Ghasemi, M.; Balar, N.; Hunt, A.; O’Connor, B. T.; Hou, J.; Ade, H., High Performance Organic Solar Cells Processed by Blade Coating in Air from a Benign Food Additive Solution. Chem. Mater. 2016, 28 (20), 7451-7458. [3] Ye, L.; Zhao, W.; Li, S.; Mukherjee, S.; Carpenter, J. H.; Awartani, O.; Jiao, X.; Hou, J.; Ade, H., High-Efficiency Nonfullerene Organic Solar Cells: Critical Factors that Affect Complex Multi-length Scale Morphology and Device Performance. Adv. Energy Mater. 2017, 7, 1602000. [4] Ye, L.; Jiao, X.; Zhang, S.; Yao, H.; Qin, Y.; Ade, H.; Hou, J., Control of Mesoscale Morphology and Photovoltaic Performance in Diketopyrrolopyrrole-Based Small Band Gap Terpolymers. Adv. Energy Mater. 2017, 7, 1601138. [5] Ye, L.; Jiao, X.; Zhao, W.; Zhang, S.; Yao, H.; Li, S.; Ade, H.; Hou, J., Manipulation of Domain Purity and Orientational Ordering in High Performance All-Polymer Solar Cells. Chem. Mater. 2016, 28 (17), 6178-6185.

Paper Details

Date Published: 19 September 2017
Proc. SPIE 10363, Organic, Hybrid, and Perovskite Photovoltaics XVIII, 103630X (19 September 2017); doi: 10.1117/12.2276043
Show Author Affiliations
Long Ye, North Carolina State Univ. (United States)
Wenchao Zhao, Institute of Chemistry (China)
Masoud Ghasemi, North Carolina State Univ. (United States)
Yuan Xiong, North Carolina State Univ. (United States)
Jianhui Hou, Institute of Chemistry (China)
Harald W. Ade, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 10363:
Organic, Hybrid, and Perovskite Photovoltaics XVIII
Zakya H. Kafafi; Paul A. Lane; Kwanghee Lee, Editor(s)

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