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
D−π–A−π–D Structured Diketopyrrolopyrrole-Based Electron Donors for Solution-Processed Organic Solar Cells
B. Yadagiri,B. Yadagiri,K. Narayanaswamy,K. Narayanaswamy,Ravulakollu Srinivasa Rao,Ravulakollu Srinivasa Rao,Anirban Bagui,Ram Datt,Vinay Gupta,Surya Prakash Singh,Surya Prakash Singh +10 more
TL;DR: This work demonstrates that replacement of oxygen with sulfur in these kinds of small molecules remarkably improves the photovoltaic performance of OSCs.
Journal ArticleDOI
Small molecule based N-phenyl carbazole substituted diketopyrrolopyrroles as donors for solution-processed bulk heterojunction organic solar cells.
TL;DR: Two acetylene-bridged small molecules DPP5 and DPP6 with low HOMO-LUMO gaps as donors along with PC71BM as an acceptor for the fabrication of solution-processed bulk heterojunction solar cells achieve overall power conversion efficiencies up to 4.65% and 5.73%, which are superior to those for the devices based on as-cast active layers.
Journal ArticleDOI
Effect of the π-conjugation length on the properties and photovoltaic performance of A-π-D-π-A type oligothiophenes with a 4,8-bis(thienyl)benzo[1,2-b:4,5-b']dithiophene core.
TL;DR: Benzo[1,2-b:4,5-b′]dithiophene (BDT) is an excellent building block for constructing π-conjugated molecules for the use in organic solar cells and compounds with longer oligothiopheneπ-bridges have better power conversion efficiency and higher device stability.
Journal ArticleDOI
Impact of end-capped groups on the properties of dithienosilole-based small molecules for solution-processed organic solar cells
Chen Xianjie,Huanran Feng,Lin Zhijing,Jiang Zhaowei,Tian He,Shouchun Yin,Xiangjian Wan,Yongsheng Chen,Qian Zhang,Huayu Qiu +9 more
TL;DR: In this article, two acceptor-donor-acceptor small molecules DINDTS and DINCNDTS were designed and synthesized for solution-processable bulk-heterojunction (BHJ) solar cells.
Journal ArticleDOI
Reduced Energy Offsets and Low Energy Losses Lead to Efficient (∼10% at 1 sun) Ternary Organic Solar Cells
María Privado,Cristina Rodríguez Seco,Rahul Singhal,Pilar de la Cruz,Fernando Langa,Ganesh D. Sharma,Emilio Palomares +6 more
TL;DR: In this article, two organic semiconductor molecules, CS01 and MPU3, an electron donor and electron acceptor, respectively, are described for use in organic bulk heterojunction solar cells.
References
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Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure
TL;DR: In this article, the authors showed that PFN can be incorporated into polymer light-emitting devices (PLEDs) to enhance electron injection from high-work-function metals such as aluminium (work function w of 4.3 eV) and gold (w ¼ 5.2 eV).
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TL;DR: The uncovered aggregation and design rules yield three high-efficiency (>10%) donor polymers and will allow further synthetic advances and matching of both the polymer and fullerene materials, potentially leading to significantly improved performance and increased design flexibility.
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.