A new NIR absorbing DPP-based polymer for thick organic solar cells

Oklem, Gulce
Song, Xin
Toppare, Levent Kamil
Baran, Derya
Günbaş, Emrullah Görkem
Sunlight covers a broad spectrum from ultra-violet to infrared, and low band gap materials are required to utilize the near infrared region (NIR) for better photon harvesting in organic solar cells. It has been shown that copolymers comprising diketopyrrolopyrrole-based acceptors and simple donors (thiophene or furan) achieve an absorption maximum at around 800 nm. In this study, selenophene was coupled with a diketopyrrolopyrrole based acceptor to yield a polymer (PFDPPSe) with an absorption maximum at 830 nm and an absorption onset at 930 nm. The optimized organic solar cells with PFDDPSe: PC71BM active layer blends at 210 nm showed a maximum PCE of 6.16% (average 6.02%) via solvent additive engineering with an inverted device structure. Their charge transport, recombination loss mechanism, and morphology were systematically studied. The results demonstrate that a highly efficient NIR-absorbing polymer can be achieved by the introduction of selenophene and a suitable solvent additive process for NIR organic solar cells. PFDPPSe is also one of the rare examples of a polymer with a PCE of over 6% that does not contain any thiophene-based unit in its backbone.


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Baran, Derya; Toppare, Levent Kamil; Department of Chemistry (2010)
Organic semi-conductors are of great interest since these compounds can be utilized as active layers in many device applications such as ECDs, LEDs and solar cells. Incorporating the benzotriazole units into the polymer backbone enhances the optical properties of donor units. Hexyl thiophene and pyrrole are commonly used as electron donor materials. Benzotriazole can be coupled to hexyl thiophene or pyrrole to yield materials which can be polymerized to give donor acceptor type polymers. These materials are...
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The fabrication of flexible organic photovoltaics (OPVs) which utilize transparent and conducting single walled carbon nanotube (SWNT) thin films as current collecting electrodes on plastic substrates in zinc oxide nanowire (ZnO NW)/poly(3-hexylthiophene) (P3HT) bulk heterojunction photovoltaic devices is reported. The bulk heterojunctions for exciton dissociation are created by directly growing ZnO nanowires from solution on the SWNT electrodes and spin coating the P3HT polymer. A maximum OPV power convers...
A theoretical mechanistic study on electrical conductivity enhancement of DMSO treated PEDOT:PSS
Yıldırım, Erol; Yong, Xue; Tan, Teck Leong; Zhu, Qiang; Xu, Jianwei; Ouyang, Jianyong; Wang, Jian-Sheng; Yang, Shuo-Wang (Royal Society of Chemistry (RSC), 2018-05-21)
Conductive polymers have been attracting attention for decades due to their promising applications in photovoltaic cells and thermoelectrics. Among them, poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is the most extensively studied one with the features of high water dispersibility, transparency and thermal stability as well as having relatively high electrical conductivity (EC). Nevertheless, the EC of as-prepared PEDOT:PSS is still unsatisfactory for real applications. Experimental...
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Yashan, G. R.; Eremenko, A. M.; Smirnova, N. P.; Suzer, S.; Ertaş, Gülay; Tabor, Ch. (Springer Science and Business Media LLC, 2008-11-01)
We have studied the optical spectra in the UV and visible regions, the morphology by scanning electron microscopy (SEM), and the X-ray photoelectron spectra (XPS) of bimetallic Ag/Au nanoparticles incorporated into transparent silicate films in the sol-gel transition stage. The bimetallic nanoparticles, obtained by a combination of photoreduction and thermal reduction, form structures of the alloy or core-shell type.
A Practical Guide to the Preparation of Liquid Crystal-Templated Microparticles
Wang, Xiaoguang; Büküşoğlu, Emre; Abbottt, Nicholas L. (American Chemical Society (ACS), 2017-01-10)
We provide a practical guide to methods and protocols that use polymer networks templated from droplets of liquid crystal (LC) to synthesize micrometer-sized polymeric particles that are chemically patchy, are anisometric in shape, possess anisotropic optical properties, and/or are mesoporous. We describe a range of methods that permit the preparation of LC droplets (containing reactive monomers) as templates for polymerization, including formation of LC-in-water emulsions by mechanical methods (e.g., vorte...
Citation Formats
G. Oklem, X. Song, L. K. Toppare, D. Baran, and E. G. Günbaş, “A new NIR absorbing DPP-based polymer for thick organic solar cells,” JOURNAL OF MATERIALS CHEMISTRY C, pp. 2957–2961, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46281.