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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Journal ArticleDOI
Design of organic small molecules for photovoltaic application with high open-circuit voltage (Voc)
TL;DR: In this paper, the relationship between molecular structures of small molecule materials and open-circuit voltage (Voc) values for OSCs is discussed, which will provide a guideline on the design of organic small-molecule materials for obtaining photovoltaic devices with high Voc values.
Journal ArticleDOI
A–π–D–π–A based porphyrin for solution processed small molecule bulk heterojunction solar cells
Challuri Vijay Kumar,Lydia Cabau,Emmanuel N. Koukaras,Abhishek Sharma,Ganesh D. Sharma,Emilio Palomares +5 more
TL;DR: In this paper, a porphyrin with the following molecular architecture Aπ-D-π-A in which ethyl rhodanine end capping groups were linked to the core porphrin donor via an octyl thiophene-ethynylene π bridge denoted as VC117 and used it as an electron donor along with ([6,6]-phenyl C71 butyric acid methyl ester) (PC71BM) as electron acceptor for the fabrication of solution processed organic solar cells.
Journal ArticleDOI
An Organic Dyad Composed of Diathiafulvalene‐Functionalized Diketopyrrolopyrrole–Fullerene for Single‐Component High‐Efficiency Organic Solar Cells
K. Narayanaswamy,K. Narayanaswamy,A. Venkateswararao,P. Nagarjuna,P. Nagarjuna,Swati Bishnoi,Swati Bishnoi,Vinay Gupta,Vinay Gupta,Suresh Chand,Suresh Chand,Surya Prakash Singh,Surya Prakash Singh +12 more
TL;DR: A new low-band gap dyad DPP-Ful, which consists of covalently linked dithiafulvalene-functionalized diketopyrrolopyrrole as donor and fullerene as the acceptor, has been designed and synthesized.
Journal ArticleDOI
Naphtho[1,2-b:5,6-b′]dithiophene-Based Small Molecules for Thick-Film Organic Solar Cells with High Fill Factors
Xiangwei Zhu,Benzheng Xia,Kun Lu,Huan Li,Ruimin Zhou,Jianqi Zhang,Yajie Zhang,Zhigang Shuai,Zhixiang Wei +8 more
TL;DR: In this paper, two acceptor-donor-acceptor type small molecules based on a two-dimensional conjugated naphtho[1,2-b:5,6-b′]dithiophene (NDT) unit containing alkylthienyl side chains were designed and synthesized.
Journal ArticleDOI
Influence of alkyl chains on photovoltaic properties of 3D rylene propeller electron acceptors
Huiting Fu,Huiting Fu,Dong Meng,Xiangyi Meng,Xiaobo Sun,Lijun Huo,Yuzun Fan,Yan Li,Wei Ma,Yanming Sun,Zhaohui Wang +10 more
TL;DR: A series of propeller-shaped triperylene hexaimide (TPH) non-fullerene acceptors, featuring branched alkyl side chains with different lengths, have been designed and synthesized as mentioned in this paper.
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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.
Journal ArticleDOI
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
TL;DR: Simultaneous enhancement of open-circuit voltage, short-circuits current density, and fill factor in highly efficient polymer solar cells by incorporating an alcohol/water-soluble conjugated polymer as cathode interlayer is domonstrated.