High-efficiency photovoltaic cells with wide optical band gap polymers based on fluorinated phenylene-alkoxybenzothiadiazole

Ko, Seo Jin; Hoang, Quoc Viet; Song, Chang Eun; Uddin, Mohammad Afsar; Lim, Eunhee; Park, Song Yi; Lee, Byoung Hoon; Song, Seyeong; Moon, Sang Jin; Hwang, Sungu; Morin, Pierre; Leclerc, Mario; Su, Gregory M.; Chabinyc, Michael L.; Woo, Han Young; Shin, Won Suk; Kim, Jin Young

doi:10.1039/c6ee03051c

Cited by 85 publications

(58 citation statements)

References 60 publications

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“…[26] Whereas previousf luorination processes have usuallyi nvolvede xpensive fluorination reagents and complicated synthetic steps, cheap fluorinated benzene derivatives can easily be obtained from commercial materials. [15,27,28] Moreover,f luorinated benzene can also enhancet he molecular planarity and extinction coefficient, as well as reduce energy levels,r elative to its non-fluorinateda nalogues. For example, Kim et al reported as eries of semicrystalline polymers containing fluorinated benzene units.…”

Section: Fluorinated Polymer Donorsmentioning

confidence: 99%

“…For example, Kim et al reported as eries of semicrystalline polymers containing fluorinated benzene units. [27] They found that the fluorination number and positiono nb enzene could significantly affect the molecular photophysical and optoelectronic properties, which have ac rucial impact on the device performance. In the PC 71 BM-basedO SCs,P DTBTBz-2F-containing para-difluorinated benzene showed ah igherP CE of 9.8 %b ecause of improved molecular symmetry and crystallinity.Z hang et al [28] synthesized ap olymer,P FOPB, with tetrafluorinated 2D-phenyl-BDT.…”

Section: Fluorinated Polymer Donorsmentioning

confidence: 99%

“…For example, Kim et al. reported a series of semicrystalline polymers containing fluorinated benzene units . They found that the fluorination number and position on benzene could significantly affect the molecular photophysical and optoelectronic properties, which have a crucial impact on the device performance.…”

Section: Introductionmentioning

confidence: 99%

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Fluorinated Photovoltaic Materials for High‐Performance Organic Solar Cells

Fan

Méndez‐Romero

Guo

et al. 2019

Chemistry An Asian Journal

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Over the past decade, organic solar cells (OSCs) have achieved a dramatic boost in their power conversion efficiencies from about 6 % to over 16 %. In addition to developments in device engineering, innovative photovoltaic materials, especially fluorinated donors and acceptors, have become the dominant factor for improved device performance. This minireview highlights fluorinated photovoltaic materials that enable efficient OSCs. Impressive OSCs have been obtained by developing some important molds of fluorinated donor and acceptor systems. The molecular design strategy and the matching principle of fluorinated donors and acceptors in OSCs are discussed. Finally, a concise summary and outlook are presented for advances in fluorinated materials to realize the practical application of OSCs.

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Section: Fluorinated Polymer Donorsmentioning

confidence: 99%

Section: Fluorinated Polymer Donorsmentioning

confidence: 99%

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Fluorinated Photovoltaic Materials for High‐Performance Organic Solar Cells

Fan

Méndez‐Romero

Guo

et al. 2019

Chemistry An Asian Journal

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“…Five types of single‐junction devices with a device configuration of ITO/ZnO/active layer/MoO 3 /Ag were fabricated using PDTBTBz‐2F, PBTDT, PPDT2FBT, PTB7‐Th, and P2 blends with PC 71 dM. Optimal device conditions of PDTBTBz‐2F, PPDT2FBT, PTB7‐Th, P2 blends were adopted and based on previous studies from our group . In addition, the new wide‐bandgap donor polymer PBTDT was recently synthesized and optimized by our group; the synthetic details are included in the Supporting Information.…”

Section: Tm Simulationsmentioning

confidence: 99%

Modeling and implementation of tandem polymer solar cells using wide‐bandgap front cells

Choi

Hoang

et al. 2019

Carbon Energy

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Tandem device architectures offer a route to greatly increase the maximum possible power conversion efficiencies (PCEs) of polymer solar cells, however, the complexity of tandem cell device fabrication (such as selecting bandgaps of the front and back cells, current matching, thickness, and recombination layer optimization) often result in lower PCEs than are observed in single‐junction devices. In this study, we analyze the influence of front cell and back cell bandgaps and use transfer matrix modeling to rationally design and optimize effective tandem solar cell structures before actual device fabrication. Our approach allows us to estimate tandem device parameters based on known absorption coefficients and open‐circuit voltages of different active layer materials and design devices without wasting valuable time and materials. Using this approach, we have investigated a series of wide bandgap, high voltage photovoltaic polymers as front cells in tandem devices with PTB7‐Th as a back cell. In this way, we have been able to demonstrate tandem devices with PCE of up to 12.8% with minimal consumption of valuable photoactive materials in tandem device optimization. This value represents one of the highest PCE values to date for fullerene‐based tandem solar cells.

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“…Most studies have focused on the tandem architecture, in which identical or different absorber layers are used, resulting in maximum efficiencies in the range of 10-13%. [11][12][13][14][15][16][17][18][19][20][21][22] At least conceptually, stacking three absorber layers in a triple-junction solar cell can lead to a further increase in efficiency. There are few examples of triple-junction organic solar cells.…”

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confidence: 99%

Accurate Characterization of Triple‐Junction Polymer Solar Cells

Rasi

Hendriks

Wienk

et al. 2017

Advanced Energy Materials

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organic semiconductors have been developed to absorb light into the near infrared region. [8] The gain in spectral coverage and short-circuit current density (J SC ) in the cells is, however, counteracted by an unavoidable loss in the open-circuit voltage (V OC ) when the bandgap decreases. [9] Given the intrinsic limits of singlejunction organic solar cells, there has been an increasing interest to develop multijunction architectures. [10] This paves the way to efficient solar cells by an improved utilization of photon energy. In a multijunction solar cell sunlight is spectrally distributed over two, or more subcells such that highenergy photons are absorbed in a wide bandgap subcell and low-energy photons in a small bandgap subcell. This reduces the thermalization losses for high-energy photons and the transmission losses for the low-energy photons. Most studies have focused on the tandem architecture, in which identical or different absorber layers are used, resulting in maximum efficiencies in the range of 10-13%. [11][12][13][14][15][16][17][18][19][20][21][22] At least conceptually, stacking three absorber layers in a triple-junction solar cell can lead to a further increase in efficiency. There are few examples of triple-junction organic solar cells. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The gain in efficiency achieved by these triple-junction devices was not always accompanied by a critical analysis of the measured performance. In a recent publication, Timmreck et al. methodically analyzed the literature on tandem organic solar cells, shedding light on the fact that the vast majority of the publications on organic tandem cells lacked a proper characterization. [42] Although the paper focused attention on the tandem structure, the argumentations provided can reasonably be extended to the case of triple-junctions. At present, the characterization of organic triple-junctions is often limited to measuring the J−V characteristics under simulated solar radiation and determining the external quantum efficiency (EQE) using different light sources to optically bias the subcells. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] Nevertheless, organic materials commonly employed for solar cells feature peculiar characteristics that necessitate special attention for their EQE measurement. [42][43][44] An accurate analysis of the effect of bias light and bias voltage on the EQE of triple-junction organic solar cells is necessary.Detailed protocols for the characterization of triple-junction solar cells are available in the literature. [45] For many inorganic triple-junction solar cells the effect of bias voltage on the spectral response is very small, which makes correction for bias voltage not critical. [45] The aim of this work is to provide a characterization protocol for organic triple-junction solar cells that take into account the uniqueness of these particular materials. In order to do so, we combine optical and electrical modeling, use

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High-efficiency photovoltaic cells with wide optical band gap polymers based on fluorinated phenylene-alkoxybenzothiadiazole

Abstract: A new series of wide band gap photovoltaic polymers based on a fluorinated phenylene-alkoxybenzothiadiazole unit with an optical band gap of over 1.90 eV are designed and utilized for high-performance single- and multi-junction bulk heterojunction polymer solar cells.

Cited by 85 publications

References 60 publications

Fluorinated Photovoltaic Materials for High‐Performance Organic Solar Cells

Fluorinated Photovoltaic Materials for High‐Performance Organic Solar Cells

Modeling and implementation of tandem polymer solar cells using wide‐bandgap front cells

Accurate Characterization of Triple‐Junction Polymer Solar Cells

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