A Metal‐Free N‐Annulated Thienocyclopentaperylene Dye: Power Conversion Efficiency of 12 % for Dye‐Sensitized Solar Cells

Yao, Zhaoyang; Zhang, Min; Li, Renzhi; Yang, Lin; Qiao, Yongna; Wang, Peng

doi:10.1002/anie.201501195

Cited by 203 publications

(111 citation statements)

References 71 publications

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“…[10] Moreover, we observed that the presence of unreacted PBA in the crude affected the solubility of the final compounds. In fact, the addition of a small amount of PBA to a PBI solution caused precipitation of the latter, especially for those bearing amino acid groups (9)(10)(11)(12). This experimental evidence confirmed the hypothesis that traces of the perylene anhydride in solution facilitate the aggregation of the PBIs.…”

Section: Resultssupporting

confidence: 67%

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Fast and Efficient Microwave‐Assisted Synthesis of Perylenebisimides

et al. 2015

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Section: Resultssupporting

confidence: 67%

“…[11] This study highlights that the main factors influencing the reactions were the steric hindrance and the polarity of amines. [12] In the experiments, the steric bulkiness at the α-carbon influenced the outcome of the reaction. Amines with a small linear structure (1-6, 12-17) gave higher yields in shorter time.…”

Section: Resultsmentioning

confidence: 99%

Fast and Efficient Microwave‐Assisted Synthesis of Perylenebisimides

et al. 2015

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“…[11][12][13][14][15][16][17][18][19] The improvements of PCE were usually associated with a decrease in V loss to some extent. [20][21][22][23][24][25][26][27][28][29] However, a targeted down-regulation of V loss , which simultaneously reduces the V loss involved in electron injection, dye regeneration and interfacial recombination processes, is scarcely reported. Here, we report a comprehensive control of V loss in DSSCs through judicious molecular engineering of the sensitizer and the redox mediator.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells

Zhang

Bahng

et al. 2018

Energy Environ. Sci.

157

141

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The relatively large voltage loss (V loss ) in excitonic type solar cells severely limits their power conversion efficiencies (PCEs). Here, we report a comprehensive control of V loss through efficacious engineering of the sensitizer and redox mediator, making a breakthrough in the PCE of dye-sensitized solar cells (DSSCs).The targeted down-regulation of V loss is successfully realized by three valid channels: (i) reducing the driving force of electron injection through dye molecular engineering, (ii) decreasing the dye regeneration overpotential through redox mediator engineering, and (iii) suppressing interfacial electron recombination.Significantly, the ''trade-off'' effect between the dye optical band gap and the open-circuit voltage (V OC ) is minimized to a great extent, achieving a distinct enhancement in photovoltaic performance (PCE 4 11.5%with V OC up to 1.1 V) for liquid junction cells. The solidification of the best-performing device leads to a PCE of 11.7%, which is so far the highest efficiency obtained for solid-state DSSCs. Our work inspires further development in highly efficient excitonic solar cells by comprehensive control of V loss . Broader contextExcitonic type solar cells, including dye-sensitized solar cells (DSSCs), perovskite solar cells (PSCs) and organic solar cells (OSCs), are potential alternatives for photovoltaic applications. To further advance their power conversion efficiencies (PCEs), it is crucial to reduce the so called voltage loss (V loss ) as much as possible. In DSSCs, the V loss mainly takes place in the electron injection, dye regeneration and interfacial recombination processes, whereas the targeted decreasing of V loss in all these aspects has been rarely reported. To address this issue, we herein demonstrate a comprehensive control of V loss , achieving 11.7% efficiency for solid-state DSSCs. This work is a good example of radically improving the PCE through rationally reducing V loss .

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“…[2][3][4][5] Indeed, these organic sensitizers have demonstrated excellent light-harvesting ability and power-conversion efficiency (PCEs) of more than 12%. [6][7][8] Until now, the most widely used donor groups for DSSCs are based on triphenylamine and its derivatives, due to their for the first time as anchoring and acceptor group for DSSCs. And for comparison, the reference dye CA-4 with traditional cyanoacrylic acid anchoring group was also synthesized.…”

Section: Introductionmentioning

confidence: 99%

Metal‐Free Sensitizers Containing Hydantoin Acceptor as High Performance Anchoring Group for Dye‐Sensitized Solar Cells

Guo

Liu

et al. 2016

Adv Funct Materials

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The anchoring group in dye‐sensitized solar cells (DSSCs) profoundly affects the electron injection and durability on TiO2 films interface. Here, the hydantoin acceptor is introduced as anchoring group for DSSCs. The hydantoin based sensitizer achieves a photovoltaic efficiency of 7.66%, compared to 4.90% for sensitizer containing the conventional cyanoacrylic acid as anchoring group. Remarkably, the hydantoin anchoring group significantly enhances the electron‐injection efficiency (Φinj) and photocurrent (Jsc). The time dependent adsorption and desorption data indicate the strong binding strength and the superiority of stability for hydantoin based sensitizers. The Fourier transform infrared measurements investigate the adsorption mechanism of hydantoin on TiO2 interface. These results strongly corroborate the advantages of incorporating hydantoin as acceptor and anchoring group. As a consequence, the sensitizer HY‐4 with hydantoin approaches the photovoltaic efficiency of 8.32% under 0.1 sunlight illumination. These observations offer a new route to design and develop efficient sensitizers for DSSCs.

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A Metal‐Free N‐Annulated Thienocyclopentaperylene Dye: Power Conversion Efficiency of 12 % for Dye‐Sensitized Solar Cells

Cited by 203 publications

References 71 publications

Fast and Efficient Microwave‐Assisted Synthesis of Perylenebisimides

Fast and Efficient Microwave‐Assisted Synthesis of Perylenebisimides

Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells

Metal‐Free Sensitizers Containing Hydantoin Acceptor as High Performance Anchoring Group for Dye‐Sensitized Solar Cells

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