A novel polymer donor based on dithieno[2,3-d:2′,3′-d′′]benzo[1,2-b:4,5-b′]dithiophene for highly efficient polymer solar cells

Huang, Jiaming; Peng, Ruixiang; Xie, Lingchao; Song, Wei; Lei, Hong; Chen, Sanhui; Wei, Qiang; Ge, Ziyi

doi:10.1039/c8ta11004b

Cited by 28 publications

(13 citation statements)

References 34 publications

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“…However, solar irradiation in the spectrum range of 300–500 nm remains unabsorbed. The construction of ternary device by introducing a third component into the photoactive layer has been proven to overcome this issue effectively, where full utilization of solar irradiation in the entire solar spectrum can be realized without complicating the traditional fabrication processes . Fullerene derivatives like phenyl‐C71‐butyric‐acid‐methyl ester (PC 71 BM) with the main absorption in the range of 300–500 nm have been commonly used as a third component to strengthen the light‐harvesting capability of active layers, thus providing a potential route to enhance the short‐circuit current density ( J sc ) and PCE …”

Section: Photovoltaic Parameters Of the Pm6:y6‐based Oscs With Varioumentioning

confidence: 99%

16.67% Rigid and 14.06% Flexible Organic Solar Cells Enabled by Ternary Heterojunction Strategy

et al. 2019

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as PM6 [13,14] and PBDB-T [15] with narrow bandgap nonfullerene acceptors (A), for example, IT-4F, [14] and Y6 [8] has remained as a wise strategy to absorb solar irradiation in the range of 500-900 nm or even up to a broader absorption region. However, solar irradiation in the spectrum range of 300-500 nm remains unabsorbed. The construction of ternary device by introducing a third component into the photoactive layer has been proven to overcome this issue effectively, where full utilization of solar irradiation in the entire solar spectrum can be realized without complicating the traditional fabrication processes. [16][17][18][19][20][21][22][23] Fullerene derivatives like phenyl-C71-butyric-acid-methyl ester (PC 71 BM) with the main absorption in the range of 300-500 nm have been commonly used as a third component to strengthen the light-harvesting capability of active layers, thus providing a potential route to enhance the short-circuit current density (J sc ) and PCE. [24] Some recent theoretical models and mechanisms have been proposed to provide guide and reference for future development of ternary devices. [25][26][27] Among them, three models which include charge transfer model, [17] energy transfer model, [28] and parallel-like or alloy-like model [16,29] have been widely accepted. In the charge transfer model, the third component in the active layer participates in the process of exciton dissociation and charge carrier generation in the donor/ acceptor interface. [22,30] A cascaded energy level distribution is the requirement for such mechanisms to take place. [31] In contrast, in the energy transfer model, the third component serves as an "energy donor" which absorbs additional solar energy and delivers it to donor or acceptor by Förster or Dexter energy transfer. [32] Ternary devices based on charge transfer or energy transfer mechanisms improve J sc by utilizing additional solar energy. [33,34] Ternary devices based on charge transfer mechanism will affect the open-circuit voltage (V oc ) while the devices based on energy transfer mechanism can hardly impact the V oc due to their roles in charge transfer and dissociation. [35] The third one is the parallel-like or alloy-like model, of which the mechanism does not require any certain energy levels.In parallel-like model, the third component serves as a donor (or acceptor) and work independently with another donor (or acceptor). [36] The ternary device can be viewed as two subcells that are mixed together. For the alloy-like model, the third component is finely mixed with one of the host components to form a two-phase morphology. In this process, dual donors Ternary heterojunction strategies appear to be an efficient approach to improve the efficiency of organic solar cells (OSCs) through harvesting more sunlight. Ternary OSCs are fabricated by employing wide bandgap polymer donor (PM6), narrow bandgap nonfullerene acceptor (Y6), and PC 71 BM as the third component to tune the light absorption and morphologies of the blend films. A record power conver...

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Section: Photovoltaic Parameters Of the Pm6:y6‐based Oscs With Varioumentioning

confidence: 99%

16.67% Rigid and 14.06% Flexible Organic Solar Cells Enabled by Ternary Heterojunction Strategy

et al. 2019

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“…The synthetic routes of the BDTT-F unit, α-BDTT-F unit, and the two D–A copolymer donors PBQ10 and α-PBQ10 are shown in Scheme . The BDTT-F unit and polymer PBQ10 are synthesized according to the literatures. ,− The synthetic details of the α-BDTT-F unit and polymer α-PBQ10 are described in the Experimental Section. The classic BDTT-F unit is synthesized according to the widely used synthetic route that contains verbose six synthetic steps and tedious 5 times purifications, which ascribes to the harsh fluorine-exchange reaction for the introduction of the F atom to the β position of thiophene (Scheme b).…”

Section: Resultsmentioning

confidence: 99%

A Cost-Effective Alpha-Fluorinated Bithienyl Benzodithiophene Unit for High-Performance Polymer Donor Material

Zhang

Sun

Qin

et al. 2021

ACS Appl. Mater. Interfaces

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To reduce synthetic cost of the classic fluorinated bithienyl benzodithiophene (BDTT-F) unit, here, an alpha-fluorinated bithienyl benzodithiophene unit, namely, α-BDTT-F (F atom in the α position of the lateral thiophene unit), is developed by the isomerization strategy of exchanging the positions of the F atom and flexible alkyl chain on the lateral thiophene unit of the BDTT-F unit. The α-BDTT-F unit was synthesized with less synthetic steps, higher synthetic yield, and less purification times from the same raw materials as those of the BDTT-F unit, thus with low synthetic cost. Theoretical calculation indicates that the α-BDTT-F unit possesses a similar twisted conformation and electronic structures as those of the BDTT-F unit. The α-BDTT-F-based polymer α-PBQ10 exhibits similar light absorption and energy levels as those of the corresponding BDTT-F-based polymer PBQ10 but marginally increased molecular aggregation and stronger hole transport than PBQ10. In consequence, the α-PBQ10:Y6-based polymer solar cell demonstrates a slightly enhanced power conversion efficiency (PCE) of 16.26% compared with that of the PBQ10:Y6-based device (PCE = 16.23%). Also, the PCE is further improved to 16.77% through subtle microscopic morphology regulation of the photoactive layer with the fullerene derivative indene-C60 bisadduct as the third component. This work provides new ideas for the design of low-cost and high-efficiency photovoltaic molecules.

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“…The incorporation of FA into binary OPVs based on NFA can improve the electron mobility due to the outperformed electron mobility of FAs, further optimizing μ h /μ e and reducing recombination, consistent with a high FF. [75][76][77][78][79][80][81][82][83][84][85][86] Besides that, the exciton dissociation is also enhanced, to boost the photoinduced current via the enlarged D/A interface. The wide application of the ternary strategy in many different binary systems based on NFA can support that the use of FA as the third component can improve device efficiency.…”

Section: Mending Charge Dynamicsmentioning

confidence: 99%

High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-fullerene Acceptors

Jiang

Zhu

2021

Organic Materials

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With the development of the non-fullerene acceptor (NFA), the use of ternary organic photovoltaic devices based on a fullerene acceptor and a NFA is now widespread, and the merits of both acceptor types can be fully utilized. However, the effective approach of enhancing device performance is adjusting the charge dynamics and the thin-film morphology of the active layer via introducing the second acceptor, which would significantly impact the open-circuit voltage, the short-circuit current, and the fill factor, thus strongly affecting device efficiency. The functions of the second acceptor in a ternary organic solar cell with a fullerene acceptor and a NFA are summarized here. These include a broader absorption spectrum; formation of a cascade energy level or energy transfer; modified thin-film morphology including phase separation, effects on crystallinity, size, and purity of domain; and vertical distribution along with improved charge dynamics like exciton dissociation and charge transport, collection, and recombination. Then, we discuss the hierarchical morphology in ternary solar cells may benefit device performance and the outlook of the ternary device.

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A novel polymer donor based on dithieno[2,3-d:2′,3′-d′′]benzo[1,2-b:4,5-b′]dithiophene for highly efficient polymer solar cells

Abstract: A novel polymer was used as the donor material in organic solar cells to achieve the best photovoltaic performance based on DTBDT.

Cited by 28 publications

References 34 publications

16.67% Rigid and 14.06% Flexible Organic Solar Cells Enabled by Ternary Heterojunction Strategy

16.67% Rigid and 14.06% Flexible Organic Solar Cells Enabled by Ternary Heterojunction Strategy

A Cost-Effective Alpha-Fluorinated Bithienyl Benzodithiophene Unit for High-Performance Polymer Donor Material

High-Performance Ternary Organic Solar Cells Enabled by Synergizing Fullerene and Non-fullerene Acceptors

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