Improved Light Harvesting and Improved Efficiency by Insertion of an Optical Spacer (ZnO) in Solution-Processed Small-Molecule Solar Cells

Kyaw, Aung Ko Ko; Wang, Dong Hwan; Wynands, David; Zhang, Jie; Nguyen, Thuc‐Quyen; Bazan, Guillermo C.; Heeger, Alan J.

doi:10.1021/nl401758g

Cited by 574 publications

(508 citation statements)

References 42 publications

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“…The dependence of J SC upon illumination intensity is plotted on a double log scale and can be fitted to a power law according the relation: J SC ∝ ( P light ) α , where the value of the exponential factor (α) suggests the strength of the bimolecular recombination 45, 46. The closer α to unity means the less bimolecular recombination 47. As shown in Figure 4c, the resulting values of α was 0.986 for AZO‐based devices, 0.980 and 0.976 for the devices with or without TFE treatments, respectively.…”

Section: Resultsmentioning

confidence: 99%

Regular Organic Solar Cells with Efficiency over 10% and Promoted Stability by Ligand‐ and Thermal Annealing‐Free Al‐Doped ZnO Cathode Interlayer

Liu

Wang

et al. 2017

Advanced Science

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Landmark power conversion efficiency (PCE) over 10% has been accomplished in the past year for single‐junction organic solar cell (OSCs), suggesting a promising potential application of this technology. However, most of the high efficient OSCs are based on inverted configuration. Regular structure OSCs with both high efficiency and good stability are still rarely reported to date. In this work, by utilizing a new designed ligand‐free and non‐thermal‐annealing‐treated Al‐doped ZnO cathode interlayer, high efficiency and greatly improved stability are simultaneously realized in regular OSCs. The highest PCE of 10.14% is accomplished for single‐junction regular OSCs with active blend of poly [[2,6′‐4,8‐di(5‐ethylhexylthienyl)benzo[1,2‐b;3,3‐b]dithiophene][3‐fluoro‐2[(2‐ethylhexyl)carbonyl]thieno [3,4‐b]thiophenediyl]] (PTB7‐Th):[6,6]‐phenyl C71‐butyric acid methyl ester (PC71BM). Excellent device stability is confirmed as well, by keeping 90% of its initial PCE value after 135 d in N2, and 80% of its initial PCE value after 15 d in ambient air, respectively. Furthermore, the applicability of the designed interlayer in regular OSCs is demonstrated by other active blend systems, including the nonfullerene material. This work highlights that high efficiency and good stability can be realized simultaneously in regular OSCs as well, and will provide referential strategy and methodology for this target.

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Section: Resultsmentioning

confidence: 99%

Regular Organic Solar Cells with Efficiency over 10% and Promoted Stability by Ligand‐ and Thermal Annealing‐Free Al‐Doped ZnO Cathode Interlayer

Liu

Wang

et al. 2017

Advanced Science

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“…To date, the highest reported PCEs are in the range of 6.7%-8.94% for small molecule [39][40][41], 8.4%-10.6% for polymer OPVs [42][43][44] and 7%-15% for perovskite OPVs [45][46][47]. The recent developments in OPVs open the way toward low-cost, environmentally-benign and renewable power sources.…”

Section: Introductionmentioning

confidence: 99%

Towards High Performance Organic Photovoltaic Cells: A Review of Recent Development in Organic Photovoltaics

2014

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Organic photovoltaic cells (OPVs) have been a hot topic for research during the last decade due to their promising application in relieving energy pressure and environmental problems caused by the increasing combustion of fossil fuels. Much effort has been made toward understanding the photovoltaic mechanism, including evolving chemical structural motifs and designing device structures, leading to a remarkable enhancement of the power conversion efficiency of OPVs from 3% to over 15%. In this brief review, the advanced progress and the state-of-the-art performance of OPVs in very recent years are summarized. Based on several of the latest developed approaches to accurately detect the separation of electron-hole pairs in the femtosecond regime, the theoretical interpretation to exploit the comprehensive mechanistic picture of energy harvesting and charge carrier generation are discussed, especially for OPVs with bulk and multiple heterojunctions. Subsequently, the novel structural designs of the device architecture of OPVs embracing external geometry modification and intrinsic structure decoration are presented. Additionally, some approaches to further increase the efficiency of OPVs are described, including thermotics and dynamics modification methods. Finally, this review highlights the challenges and prospects with the aim of providing a better understanding towards highly efficient OPVs.

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“…Solution-processed small-molecule (SM) donors have stimulated much interest as a viable alternative to the widely studied conjugated polymers for organic bulk heterojunction (BHJ) solar cells [1][2][3][4]. Solution-processed SM donors have the advantage over conjugated polymer counterparts since the SM donor molecules are monodisperse and can be purified using reproducible fabrication protocols and therefore provide more uniform performance in SM-based devices [5,6].…”

Section: Introductionmentioning

confidence: 99%

Influence of gold-silica nanoparticles on the performance of small-molecule bulk heterojunction solar cells

Kyaw

Peng

et al. 2015

Organic Electronics

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a b s t r a c tLight trapping by gold (Au)-silica nanospheres and nanorods embedded in the active layer of small-molecule (SM) organic solar cell has been systematically compared. Nanorod significantly outperforms nanosphere because of more light scattering and higher quality factor for localized surface plasmon resonance (LSPR) triggered by nanorods. The optimum concentration of nanorod was characterized by charge carrier transport and morphology of the active layers. At optimum nanorod concentration, almost no change in the morphology of the active layer reveals that LSPR and scattering effects rather than the morphology are mainly responsible for the enhanced power conversion efficiency. In addition, the preliminary lifetime studies of the SM solar cells with and without Au-silica nanorods were conducted by measuring the current density-voltage characteristics over 20 days. The results show that plasmonic device with nanorods has no adverse impact on the device stability.

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Improved Light Harvesting and Improved Efficiency by Insertion of an Optical Spacer (ZnO) in Solution-Processed Small-Molecule Solar Cells

Cited by 574 publications

References 42 publications

Regular Organic Solar Cells with Efficiency over 10% and Promoted Stability by Ligand‐ and Thermal Annealing‐Free Al‐Doped ZnO Cathode Interlayer

Regular Organic Solar Cells with Efficiency over 10% and Promoted Stability by Ligand‐ and Thermal Annealing‐Free Al‐Doped ZnO Cathode Interlayer

Towards High Performance Organic Photovoltaic Cells: A Review of Recent Development in Organic Photovoltaics

Influence of gold-silica nanoparticles on the performance of small-molecule bulk heterojunction solar cells

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