A donor–acceptor–acceptor molecule for vacuum-processed organic solar cells with a power conversion efficiency of 6.4%

Chiu, Shi‐Wen; Lin, Li‐Yen; Lin, Hao‐Wu; Chen, Yihong; Huang, Zhiyong; Lin, Yu‐Ting; Lin, Francis; Liu, Yi-Hung; Wong, Ken‐Tsung

doi:10.1039/c2cc16390j

Cited by 152 publications

(73 citation statements)

References 27 publications

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“…By delicate device optimizations including fine-tuning the thicknesses of active layer and the blended D:A ratio, vacuum-deposited devices based on 37 and C 70 possessed a best PCE of 6.8% under AM1.5G simulated solar illumination. In the same year, 38 possessing of D-A-A molecular architecture were also showed by their group [96]. Compared with 36, 38 features electron-deficient pyrimidine as bridge to connect the ditolylaminothienyl electron-donating moiety and dicyanovinylene electron-withdrawing moiety.…”

Section: π-Linkage With Arene and Heterocyclementioning

confidence: 99%

π-Linkage effect of push-pull-structure organic small molecules for photovoltaic application

Yin

2016

Sci. China Mater.

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Much attention has been paid to the push-pullstructure organic small molecule (OSM) materials for photovoltaic (PV) application in the past decade, due to their facile reduction of energy band gap (Eg) and effective control of PV properties. π-bridge plays an important role in the push-pull-structure OSMs since an appropriate π-linkage is crucial for improving the PV performance of organic solar cells (OSCs). In this review, various π-bridge groups (thiophene, alkene, alkyne, arene and heterocycle) and the pertinent π-linkage effect will be systematically summarized. These results suggest that the in-depth study of the π-linkage effect is essential to deeply understanding the relationship between the molecular structure and property, thus improving PV performance.

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Section: π-Linkage With Arene and Heterocyclementioning

confidence: 99%

π-Linkage effect of push-pull-structure organic small molecules for photovoltaic application

Yin

2016

Sci. China Mater.

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“…We studied the donor, 2-{[7-(5-N,N-ditolylaminothiophen-2-yl)-2,1,3-benzothiadiazol-4-yl]methylene}malononitrile [ 13,27,28 ] (DTDCTB), and the acceptor, C 60 . The DTDCTB and C 60 molecules absorb at wavelengths of λ = 500-800 nm and 350-650 nm.…”

Section: Methodsmentioning

confidence: 99%

“…[ 8 ] This class of materials can form self-organized nanostructures in neat fi lms, [9][10][11] and often domains or amorphous morphologies are found in blends of more than one molecule, as in the case of high performance mixed donor (D)-acceptor (A) heterojunctions. [ 12,13 ] In such mixtures, charges can be trapped at grain boundaries [ 6 ] or at the interfaces between D and A domains. [ 14 ] Thus, characterization of trapped charges is important for understanding charge transport and improving device performance.…”

Section: Doi: 101002/adma201403198mentioning

confidence: 99%

Charge Trapping in Mixed Organic Donor–Acceptor Semiconductor Thin Films

2014

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A pump-probe method, whereby trapped charges are optically induced to contribute to the total photocurrent, is applied to quantitatively determine the trap density in small-molecule organic semiconductor thin films and donor-acceptor blends used in organic solar cells. The trapped charge density is correlated to the cell performance, and the dependence of charge trapping on the presence of nanocrystalline domains is discussed.

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“…In cells with C 70 as the electron acceptor, this chromophore based on an electron-donating ditoluylaminothienyl moiety and an electron-withdrawing dicyanovinylene moiety has demonstrated promising efficiencies up to ≈5.8 % [101]. Chemically similar dyes have achieved efficiencies of ≈6.4 % [102]. The dimerization of the dye into very close π-stacks, as measured by X-ray diffraction, was considered an important contribution to the high efficiency of this system.…”

Section: Vacuum-deposited Materialsmentioning

confidence: 97%

Organic Photovoltaics

DeLongchamp

2015

Semiconductor Materials for Solar Photovoltaic Cells

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Organic photovoltaics (OPV) describes a group of technologies wherein the active layer of a solar cell is composed of hydrocarbon-based organic materials [1][2][3]. OPV occupies a special niche among solar energy technologies in that it could potentially satisfy the growing energy needs of the world with a product that is sustainable, elementally abundant, and cheaply manufactured. OPV cells have recently seen a dramatic uptick in reported efficiencies, with power conversion efficiencies reaching ≈11 %, as shown in Fig. 6.1 [4,5]. These increases in power conversion efficiency have largely been driven by the development and discovery of new OPV active layer materials and new ways to process them. The technology has gained significant commercial attention over the past decade, as its unique attributes merit consideration for a place in the landscape of distributed energy generation devices [6]. Some of OPV advantages include a flexible form factor and facile processing, either from fluids or from vacuum deposition.At least two different device designs are often regarded as OPV technologies. The first is based on a solid-state OPV cell, having typically two organic semiconductors in a bilayer or distributed heterojunction arrangement. The second type, which will not be addressed in this chapter, is more typically called a dye-sensitized solar cell (DSSC) [7], which relies on a mesoporous electron conductor that is typically inorganic, a sensitizing dye, and an ion-conducting redox electrolyte. Unlike organic heterojunctions, the DSSC contains liquid and thus faces challenges in packaging and limited flexibility.The first report of a solid-state OPV cell was as early as 1959, when a photovoltaic effect in ≈10-μm-thick anthracene crystals was reported [8].

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A donor–acceptor–acceptor molecule for vacuum-processed organic solar cells with a power conversion efficiency of 6.4%

Abstract: A D-A-A-type molecular donor (DTDCTP) featuring electron-accepting pyrimidine and dicyanovinylene blocks has been synthesized for vacuum-deposited planar-mixed heterojunction solar cells with C(70) as the acceptor, giving a power conversion efficiency as high as 6.4%.

Cited by 152 publications

References 27 publications

π-Linkage effect of push-pull-structure organic small molecules for photovoltaic application

π-Linkage effect of push-pull-structure organic small molecules for photovoltaic application

Charge Trapping in Mixed Organic Donor–Acceptor Semiconductor Thin Films

Organic Photovoltaics

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