Organic and solution-processed tandem solar cells with 17.3% efficiency

Meng, Lingxian; Zhang, Yamin; Wan, Xiangjian; Li, Chenxi; Zhang, Xin; Li, Han; Ke, Xuezhi; Xiao, Zuo; Ding, Liming; Xia, Ruoxi; Yip, Hin‐Lap; Cao, Yong; Chen, Yongsheng

doi:10.1126/science.aat2612

Cited by 2,380 publications

(1,575 citation statements)

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“…[3] The latter is significantly higher than the record PCE values reported to date for single-junction OPVs. Indeed, multijunction OPV devices have been investigated widely and certified PCE values of ≈17.29% have been reported for 2T tandem cells.…”

Section: Resultsmentioning

confidence: 72%

“…Subsequently, transfer matrix modelling and Kirchhoff's law were applied to construct the overall J-V curve for the multijunction OPV device. [3,[5][6][7] As shown in Figure 7b,c and Table S2 (Supporting Information), our simulations indicate that maximum PCE values as high as 25% can be expected for optimized two-terminal tandem OPV cells (i.e., by combining optical bandgap of front and back-cell of 2 and 1.4 eV, respectively) with μ n = μ p = 10 −3 cm 2 V −1 s −1 , and k = 10 −12 cm 3 s −1 . Figure 7c reveals that the PCE for tandem OPVs is maximized when the optical bandgap of the front and back-cell is in the range of 1.8-2 eV and 1.2-1.5 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[1] In the past few years rapid progress has been made in the development of a variety of NFAs, including both polymeric and small molecule organics. [3] Compared to fullerene acceptor-based devices, they exhibit not only higher PCE but also improved morphological and photochemical stability, [2,4,[8][9][10][11][12] while offering significant promise for further performance improvement. [2][3][4][5][6][7] The best power conversion efficiencies (PCEs) of OPVs have exceeded 14% in single-junction devices [2,4] and over 17% in two-terminal (2T) tandem devices.…”

Section: Doi: 101002/advs201802028mentioning

confidence: 99%

“…[3,[13][14][15] While those studies have used simple empirical models, we use a commercially available 1D numerical drift-diffusion device simulator to re-evaluate the efficiency limit for NFA-based OPVs. [3,[13][14][15] While those studies have used simple empirical models, we use a commercially available 1D numerical drift-diffusion device simulator to re-evaluate the efficiency limit for NFA-based OPVs.…”

Section: Doi: 101002/advs201802028mentioning

confidence: 99%

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Key Parameters Requirements for Non‐Fullerene‐Based Organic Solar Cells with Power Conversion Efficiency >20%

et al. 2019

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The reported power conversion efficiencies (PCEs) of nonfullerene acceptor (NFA) based organic photovoltaics (OPVs) now exceed 14% and 17% for single‐junction and two‐terminal tandem cells, respectively. However, increasing the PCE further requires an improved understanding of the factors limiting the device efficiency. Here, the efficiency limits of single‐junction and two‐terminal tandem NFA‐based OPV cells are examined with the aid of a numerical device simulator that takes into account the optical properties of the active material(s), charge recombination effects, and the hole and electron mobilities in the active layer of the device. The simulations reveal that single‐junction NFA OPVs can potentially reach PCE values in excess of 18% with mobility values readily achievable in existing material systems. Furthermore, it is found that balanced electron and hole mobilities of >10 −3 cm 2 V −1 s −1 in combination with low nongeminate recombination rate constants of 10 −12 cm 3 s −1 could lead to PCE values in excess of 20% and 25% for single‐junction and two‐terminal tandem OPV cells, respectively. This analysis provides the first tangible description of the practical performance targets and useful design rules for single‐junction and tandem OPVs based on NFA materials, emphasizing the need for developing new material systems that combine these desired characteristics.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Doi: 101002/advs201802028mentioning

confidence: 99%

Section: Doi: 101002/advs201802028mentioning

confidence: 99%

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Key Parameters Requirements for Non‐Fullerene‐Based Organic Solar Cells with Power Conversion Efficiency >20%

et al. 2019

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“…[33][34][35][36][37][38] To the best of our knowledge, the vast majority of single-junction OPV cells with 13% PCEs were fabricated based on NFAs while the fullerene-based devices got the best efficiencies around 12%. [33][34][35][36][37][38] To the best of our knowledge, the vast majority of single-junction OPV cells with 13% PCEs were fabricated based on NFAs while the fullerene-based devices got the best efficiencies around 12%.…”

mentioning

confidence: 99%

Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

et al. 2019

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inorganic photovoltaic cells based on crystal-silicon, the solution processability of OPV cells makes it suitable for the largescale solution production at room temperature via the roll-to-roll method, which promises low-cost and large area device fabrication onto flexible substrates. [4][5][6] Benefiting from the great efforts devoted to the design of new materials, [7][8][9][10][11][12][13] optimization of the blend morphology, [14][15][16][17][18] understanding the charge generation mechanism, [19][20][21][22][23][24][25][26] significant progress has been achieved in the last few years. Recently, the power conversion efficiencies (PCEs) of OPV cells have surpassed ≈15%. [27][28][29] However, the devices with cutting-edge performance are fabricated using highly toxic solvents like chlorinated and/or aromatic solvents, which is not adaptable for large-scale production and becoming a severe problem that hinders the mass production of the OPV cells. Therefore, the material design of OPV materials should take both the efficiency and processability into consideration.At present, the commonly used processing solvents for high-performance OPV materials are chlorobenzene (CB) and chloroform (CF), as they possess excellent dissolving capability of the highly conjugated structures. [30][31][32] Over the last few years, the design and application of nonfullerene acceptors (NFAs) have achieved Recent advances in nonfullerene acceptors (NFAs) have enabled the rapid increase in power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. However, this progress is achieved using highly toxic solvents, which are not suitable for the scalable large-area processing method, becoming one of the biggest factors hindering the mass production and commercial applications of OPVs. Therefore, it is of great importance to get good eco-compatible processability when designing efficient OPV materials. Here, to achieve high efficiency and good processability of the NFAs in eco-compatible solvents, the flexible alkyl chains of the highly efficient NFA BTP-4F-8 (also known as Y6) are modified and BTP-4F-12 is synthesized. Combining with the polymer donor PBDB-TF, BTP-4F-12 shows the best PCE of 16.4%. Importantly, when the polymer donor PBDB-TF is replaced by T1 with better solubility, various eco-compatible solvents can be applied to fabricate OPV cells. Finally, over 14% efficiency is obtained with tetrahydrofuran (THF) as the processing solvent for 1.07 cm 2 OPV cells by the blade-coating method. These results indicate that the simple modification of the side chain can be used to tune the processability of active layer materials and thus make it more applicable for the mass production with environmentally benign solvents. Organic PhotovoltaicsOrganic photovoltaic (OPV) cells consisting of organic layers as photoactive materials are one of the most promising next-generation photovoltaic technologies to harvest clean and renewable solar energy. [1][2][3] When compared with the conventional

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Low Bandgap Polymers

Neshchadin

2022

Encyclopedia of Polymer Science and Technology

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The field of low bandgap organic conjugated polymers has found broad applications with efforts over the past decade. This article gives a brief overview of the recent progress of their synthesis and several applications for polymer solar cells, photodetectors, and bioimaging materials. Synthetic methods cover ground from Stille and Suzuki polycondensations to direct arylation polymerization. Donor–acceptor or ‘push–pull’ structures are generally necessary to lower bandgap of conjugated polymers, and this design strategy provides a rational approach to tune polymer energy levels as HOMO is mostly determined by donor units and conjugation, while LUMOs are determined by acceptor moieties. Special attention is given to the extraction of principles for efficient design of materials with desired properties. For efficient device performance, it is important to match the energy levels of functional materials with other device components and chosen applications, while maintaining solubility and good processability.

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Organic and solution-processed tandem solar cells with 17.3% efficiency

Cited by 2,380 publications

References 49 publications

Key Parameters Requirements for Non‐Fullerene‐Based Organic Solar Cells with Power Conversion Efficiency >20%

Key Parameters Requirements for Non‐Fullerene‐Based Organic Solar Cells with Power Conversion Efficiency >20%

Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

Low Bandgap Polymers

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