Journal ArticleDOI
A series of simple oligomer-like small molecules based on oligothiophenes for solution-processed solar cells with high efficiency.
Bin Kan,Miaomiao Li,Qian Zhang,Feng Liu,Xiangjian Wan,Yunchuang Wang,Wang Ni,Guankui Long,Xuan Yang,Huanran Feng,Yi Zuo,Mingtao Zhang,Fei Huang,Yong Cao,Thomas P. Russell,Yongsheng Chen +15 more
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TLDR
The results demonstrate that a fine and balanced modification/design of chemical structure can make significant performance differences and that the performance of solution-processed small-molecule-based solar cells can be comparable to or even surpass that of their polymer counterparts.Abstract:
A series of acceptor-donor-acceptor simple oligomer-like small molecules based on oligothiophenes, namely, DRCN4T-DRCN9T, were designed and synthesized. Their optical, electrical, and thermal properties and photovoltaic performances were systematically investigated. Except for DRCN4T, excellent performances were obtained for DRCN5T-DRCN9T. The devices based on DRCN5T, DRCN7T, and DRCN9T with axisymmetric chemical structures exhibit much higher short-circuit current densities than those based on DRCN6T and DRCN8T with centrosymmetric chemical structures, which is attributed to their well-developed fibrillar network with a feature size less than 20 nm. The devices based on DRCN5T/PC71BM showed a notable certified power conversion efficiency (PCE) of 10.10% under AM 1.5G irradiation (100 mW cm(-2)) using a simple solution spin-coating fabrication process. This is the highest PCE for single-junction small-molecule-based organic photovoltaics (OPVs) reported to date. DRCN5T is a rather simpler molecule compared with all of the other high-performance molecules in OPVs to date, and this might highlight its advantage in the future possible commercialization of OPVs. These results demonstrate that a fine and balanced modification/design of chemical structure can make significant performance differences and that the performance of solution-processed small-molecule-based solar cells can be comparable to or even surpass that of their polymer counterparts.read more
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The influence of the central acceptor unit on the optoelectronic properties and photovoltaic performance of A–D–A–D–A-type co-oligomers
TL;DR: In this paper, a series of A-D-A-D -A-type co-oligomers, comprising DTP moieties as the electron donor, and thieno[2,3-c]pyrrole-4,6-dione (TPD) or benzo[c][1,2,5]thiadiazole (BTDA) groups as the terminal acceptor units, were introduced for the elongation of the π-conjugated backbone.
Journal ArticleDOI
Underlying effects of diiodooctane as additive on the performance of bulk heterojunction organic solar cells based small organic molecule of isatin-core moiety
TL;DR: In this paper, a D-A type π-conjugated organic chromophore, 1hexyl-5-(5′-hexyl-[2,2′-bithiophen]-5-yl)indoline-2,3-dione (RBTh-NR) using isatin-core moiety as strong electron-acceptor and terminal alkyl bithiophene as electron-donor was used as donor material for the fabrication of the solution processed bulk heterojunction organic solar cells (BHJ-SMOSCs)
Journal ArticleDOI
Thermally Stable Dibenzo[def,mno]chrysene-Based Polymer Solar Cells: Effect of Thermal Annealing on the Morphology and Photovoltaic Performances
TL;DR: In this paper, the photovoltaic performances of dibenzo[def,mno]chrysene-based polymer (poly(2,2′-thiophenevinylenthiophene-4,10]-6,12-bis(2-decyltetradecyloxy)-dibenzos[def,mno]-chrysenes]) (PTVTC) or poly(4, 10-bithiophene-6, 12-bis (2-Decyltetric acid methyl ester) (PT
Journal ArticleDOI
Hetero aromatic donors as effective terminal groups for DPP based organic solar cells
Marri Anil Reddy,Ch. Pavan Kumar,Ch. Pavan Kumar,Akudari Ashok,Abhishek Sharma,Ganesh D. Sharma,Malapaka Chandrasekharam,Malapaka Chandrasekharam +7 more
TL;DR: In this paper, four solution-processable donor-acceptor-donor (D-A-D)-structured low bandgap small molecules (CSDPP5, CSDPP6, CS DPP7, and CSSPP8) with diketopyrrolopyrrole as central acceptor unit and phenoxazine (POZ) or carbazole (CBZ) as terminal unit were designed, synthesized and characterized.
Journal ArticleDOI
Impact of self-assembly on the photovoltaic properties of a small molecule oligothiophene donor
Amanpreet Kaur Hundal,Anubha Agarwal,Mohammed A. Jameel,Salman Syed Ali,Jingyu Chen,Navneet Kaur,Lathe A. Jones,Jingliang Li,Steven J. Langford,Akhil Gupta +9 more
TL;DR: In this article, the positive impact of self-assembly on the photovoltaic properties of a donor-π-acceptor oligothiophene molecule coded as CP3, which contains a barbituric acid as a terminal acceptor unit and triphenylamine as donor, enabling hydrogen-bonded spherulites to assemble in its films is described.
References
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Journal ArticleDOI
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Journal ArticleDOI
A polymer tandem solar cell with 10.6% power conversion efficiency
Jingbi You,Letian Dou,Ken Yoshimura,Takehito Kato,Kenichiro Ohya,Tom Moriarty,Keith Emery,Chun-Chao Chen,Jing Gao,Gang Li,Yang Yang +10 more
TL;DR: The development of a high-performance low bandgap polymer that enables a solution processed tandem solar cell with certified 10.6% power conversion efficiency under standard reporting conditions, which is the first certified polymer solar cell efficiency over 10%.
Journal ArticleDOI
Molecular design of photovoltaic materials for polymer solar cells: toward suitable electronic energy levels and broad absorption.
TL;DR: This Account discusses the basic requirements and scientific issues in the molecular design of high efficiency photovoltaic molecules, and summarizes recent progress in electronic energy level engineering and absorption spectral broadening of the donor and acceptor photvoltaic materials by my research group and others.
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Simultaneous Enhancement of Open-Circuit Voltage, Short-Circuit Current Density, and Fill Factor in Polymer Solar Cells
Zhicai He,Chengmei Zhong,Xun Huang,Wai Yeung Wong,Hongbin Wu,Liwei Chen,Shi-Jian Su,Yong Cao +7 more
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