Improving the efficiency of solution processable organic photovoltaic devices by a star-shaped molecular geometry

He, Chang; He, Qingguo; Yi, Yuanping; Wu, Guisheng; Bai, Fenglian; Shuai, Zhigang; Li, Yongfang

doi:10.1039/b807456a

Cited by 161 publications

(125 citation statements)

References 24 publications

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“…Also, TPA as a good electron-donating unit has been introduced to the dye-sensitized solar cells (DSSCs) [24] and small molecular BHJ organic solar cells (OSCs) [25], where it gave the versatile successes in achieving highefficacy photovoltaic performance. Li et al synthesized a series of star-shaped small molecules using TPA unit as a core and studied their photovoltaic performance detailedly, where the PCE can reach 3 % with the open circuit voltage (V oc ) as high as about 0.9 V [26][27][28][29]. In PSCs, Zhu et al introduced TPA as the pendant donor unit into the polymer side chains and synthesized a novel narrow band-gap polymer which showed the PCE of 3.08 % [30].…”

Section: Introductionmentioning

confidence: 98%

Triphenylamine-based broad band-gap polymers for bulk-heterojunction polymer solar cells

Zhang

Liang

et al. 2015

J Mater Sci

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Three triphenylamine-based broad band-gap polymers P1, P2, and P3 were designed and synthesized by Suzuki polycondensation. The optical band gaps of P1, P2, and P3 were 1.90, 19.5, and 1.99 eV, respectively. The calculated highest occupied molecular orbit energy levels of P1, P2, and P3 were -5.31, -5.29, and -5.32 eV, respectively, by cyclic voltammogram characterization. The hole mobilities of P1, P2, and P3 were 1.6 9 10 -4 , 5.9 9 10 -5 , and 4.1 9 10 -5 cm 2 v -1 s -1 , respectively, by the space charge-limited current method. The polymer solar cells were fabricated under the device architecture of ITO/PEDOT:PSS/polymer:PC 61 BM or PC 71 BM/(PFN)/Al. All solar cells displayed the high open circuit voltages, where the highest ones can reach 0.90 V for P1 and P2. The P1-and P2-based solar cells gave the best power conversion efficiency of 3.37 and 3.34 %, respectively.

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Section: Introductionmentioning

confidence: 98%

Triphenylamine-based broad band-gap polymers for bulk-heterojunction polymer solar cells

Zhang

Liang

et al. 2015

J Mater Sci

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“…Alkene including vinylene, styrene and phenylacrylonitrile is a kind of common π-bridges [58][59][60][61][62][63][64][65][66][67][68]. Introducing the alkene into D-A typed molecular architecture not only enhance the conjugation degree but also strengthen the coplanarity of the molecule.…”

Section: π-Linkage With Alkene and Its Derivativesmentioning

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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“…Compound 66 is one of these star-shaped molecules containing triphenylamine (TPA) and benzothiadiazole as the electron-donating and -accepting units, respectively [95]. Replacement of the end group of TPA in 66 with 4-hexylthiophene led to 67 and the PCE of the solar cell fabricated with 67 and [6,6]-phenyl-C 71 -butyric acid methyl ester (PC 71 BM) reached 2.39% [96].…”

Section: Conjugated Molecules For Photovoltaic Materialsmentioning

confidence: 99%

Organic π‐Conjugated Molecules for Organic Semiconductors and Photovoltaic Materials

Zhang

Zhan

Wang

et al. 2012

Organic Chemistry – Breakthroughs and Perspectives

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Improving the efficiency of solution processable organic photovoltaic devices by a star-shaped molecular geometry

Cited by 161 publications

References 24 publications

Triphenylamine-based broad band-gap polymers for bulk-heterojunction polymer solar cells

Triphenylamine-based broad band-gap polymers for bulk-heterojunction polymer solar cells

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

Organic π‐Conjugated Molecules for Organic Semiconductors and Photovoltaic Materials

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