7.7% Efficient All‐Polymer Solar Cells

Hwang, Ye-Jin; Courtright, Brett A. E.; Ferreira, Amy S.; Tolbert, Sarah H.; Jenekhe, Samson A.

doi:10.1002/adma.201501604

Cited by 421 publications

(376 citation statements)

References 49 publications

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“…If small molecules appear highly promising in particular through their 3D-edifice building ability [91,92], the best photovoltaic performances are still achieved with n-type copolymers. In particular, polymers using the strong electron withdrawing naphthalene di-imide (NDI) unit in the conjugated backbone have shown high electron mobilities and strong absorption between 500 and 750 nm, leading to high PCEs in all polymer solar cells [15,93]. As discussed previously in this review, due to its strong electronegativity, the addition of fluorine atoms along the conjugated backbone allows the lowering of both FMO energy levels.…”

Section: N-type Fluorinated Polymersmentioning

confidence: 93%

“…Also, the fluorinated derivatives of the PTB7 polymer series (see Figure 1), which were designed following the pro-quinoïdal approach, achieved a PCE above 10% [13,14]. Jenekhe et al demonstrated a PCE of 8% in all polymer solar cells using PTB7 as electron donor material [15,16]. Last but not least, fluorination has also turned out to be efficient in designing highly performing molecular semiconductors.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Backbone Fluorination on π-Conjugated Polymers in Organic Photovoltaic Devices: A Review

et al. 2016

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Solution-processed bulk heterojunction solar cells have experienced a remarkable acceleration in performances in the last two decades, reaching power conversion efficiencies above 10%. This impressive progress is the outcome of a simultaneous development of more advanced device architectures and of optimized semiconducting polymers. Several chemical approaches have been developed to fine-tune the optoelectronics and structural polymer parameters required to reach high efficiencies. Fluorination of the conjugated polymer backbone has appeared recently to be an especially promising approach for the development of efficient semiconducting polymers. As a matter of fact, most currently best-performing semiconducting polymers are using fluorine atoms in their conjugated backbone. In this review, we attempt to give an up-to-date overview of the latest results achieved on fluorinated polymers for solar cells and to highlight general polymer properties' evolution trends related to the fluorination of their conjugated backbone.

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Section: N-type Fluorinated Polymersmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Impact of Backbone Fluorination on π-Conjugated Polymers in Organic Photovoltaic Devices: A Review

et al. 2016

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“…Recently, the power conversion efficiency (PCE) of “polymer:nonfullerene” solar cells with nonfullerene‐type electron acceptors has reached ≈11–13% by introducing polymer donors with bithienylbenzodithiophene (BDTT)‐based units and nonfullerene acceptors with indacenodithienothiophene (IT)‐based derivatives 15, 16, 17, 18, 19. However, less attention has been paid to applying such interfacial layers for polymer:nonfullerene solar cells, particularly for the inverted‐type device structures that benefit from the use of stable top electrodes with high work functions including, e.g., silver (see Table S1 in the Supporting Information) 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30…”

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Polymer:Nonfullerene Solar Cells with Quaterthiophene‐Containing Polyimide Interlayers

et al. 2018

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Interfacial layers (interlayers) are one of the emerging approaches in organic solar cells with bulk heterojunction (BHJ) layers because the solar cell efficiency can be additionally improved by their presence. However, less attention is paid to the use of interlayers for polymer:nonfullerene solar cells, which have strong advantages over polymer:fullerene solar cells. In addition, most polymers used for the interlayers possess a low glass transition temperature (T g). Here, it is demonstrated that two types of quarterthiophene‐containing polyimides (PIs) with high T g (>198 °C), which are synthesized using pyromellitic dianhydride (PMDA) and cyclobutane‐1,2,3,4‐tetracarboxylic dianhydride (CTCDA), can act as an interfacial layer in the polymer:nonfullerene solar cells with the BHJ layers of poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione))] (PBDB‐T) and 3,9‐bis(2‐methylene(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene) (ITIC), or (3‐(1,1‐dicyanomethylene)‐1‐methyl‐indanone)‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2′,3′‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]‐dithiophene) (IT‐M). Interestingly, the efficiency and stability of devices are improved by the PMDA‐based PI interlayers with a stretched chain structure but degraded by the CTCDA‐based PI interlayers with a bended chain structure.

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“…These properties of the polymer/polymer blend system are greatly beneficial for future applications in portable and wearable devices that require both high performances and mechanical stability [1]. Therefore, polymer/polymer blend solar cells have recently received considerable attention and significant strides have been made in improving their power conversion efficiencies (PCEs) [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Ternary Blend of Conjugated Polymers for Broadening the Absorption Bandwidth of Polymer Solar Cells

Benten

Nishida

Mori

et al. 2016

J. Photopol. Sci. Technol.

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Ternary blend all-polymer solar cells are developed to broaden the absorption bandwidth of the photoactive layer. A wide-bandgap polymer with absorption in the visible region is introduced as a third polymer into a low-bandgap donor/acceptor binary polymer blend showing absorption in the near-infrared (NIR) region. In the ternary blend solar cell, the external quantum efficiency (EQE) is improved in the visible wavelength region, while retaining the excellent EQE of the host binary blend in the NIR wavelength region. These results demonstrate that the use of ternary blends of conjugated polymers containing a wide-bandgap polymer as a visible sensitizer is an effective approach for improving the efficiency of all-polymer solar cells.

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7.7% Efficient All‐Polymer Solar Cells

Cited by 421 publications

References 49 publications

Impact of Backbone Fluorination on π-Conjugated Polymers in Organic Photovoltaic Devices: A Review

Impact of Backbone Fluorination on π-Conjugated Polymers in Organic Photovoltaic Devices: A Review

High‐Efficiency Polymer:Nonfullerene Solar Cells with Quaterthiophene‐Containing Polyimide Interlayers

Ternary Blend of Conjugated Polymers for Broadening the Absorption Bandwidth of Polymer Solar Cells

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