Ternary Polymer Solar Cells based on Two Acceptors and One Donor for Achieving 12.2% Efficiency

Zhao, Wenchao; Li, Sunsun; Zhang, Shaoqing; Liu, Xiaoyu; Hou, Jianhui

doi:10.1002/adma.201604059

Cited by 331 publications

(229 citation statements)

References 66 publications

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“…From all of the height images, small fiber-like aggregations can be observed. These fiber-like features of the blends are ascribed mainly to the PBDB-T, because this polymer has strong aggregation effect in solution and in the solid films, and the similar phenomenon was also observed in our previous reports [41,53,61]. As a result, understanding the performance difference among these blend films requires in-depth characterizations of molecular packing and bulk morphology.…”

Section: Surface Morphologymentioning

confidence: 94%

“…1c) with a conventional configuration of ITO/PEDOT:PSS/PBDB-T:IT-M/ PFN-Br/Al were fabricated, and the PEDOT:PSS and PFNBr were utilized as the p-type and n-type interlayers, respectively [61]. The weight ratio of PBDB-T and IT-M maintains at 1:1 and the thickness of the active layers is kept at around 100 nm by referring our recent studies [41,54].…”

Section: Device Performancementioning

confidence: 99%

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Environmentally-friendly solvent processed fullerene-free organic solar cells enabled by screening halogen-free solvent additives

Zhao

et al. 2017

Sci. China Mater.

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Though the power conversion efficiencies (PCEs) of organic solar cells (OSCs) have been boosted to 12%, the use of highly pollutive halogenated solvents as the processing solvent significantly hinders the mass production of OSCs. It is thus necessary to achieve high-efficiency OSCs by utilizing the halogen-free and environmentally-friendly solvents. Herein, we applied a halogen-free solvent system (oxylene/1-phenylnaphthalene, XY/PN) for fabricating fullerene-free OSCs, and a high PCE of 11.6% with a notable fill factor (FF) of 72% was achieved based on the PBDB-T:IT-M blend, which is among the top efficiencies of halogen-free solvent processed OSCs. In addition, the influence of different halogen-free solvent additives on the blend morphology and device performance metrics was studied by synchrotron-based tools and other complementary methods. Morphological results indicate the highly ordered molecular packing and highest average domain purity obtained in the blend films prepared by using XY/PN co-solvent are favorable for achieving increased FFs and thus higher PCEs in the devices. Moreover, a lower interaction parameter (χ) of the IT-M:PN pair provides a good explanation for the more favorable morphology and performance in devices with PN as the solvent additive, relative to those with diphenyl ether and Nmethylpyrrolidone. Our study demonstrates that carefully screening the non-halogenated solvent additive plays a vital role in realizing the efficient and environmentally-friendly solvent processed OSCs.

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Section: Surface Morphologymentioning

confidence: 94%

Section: Device Performancementioning

confidence: 99%

Environmentally-friendly solvent processed fullerene-free organic solar cells enabled by screening halogen-free solvent additives

Zhao

et al. 2017

Sci. China Mater.

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“…Various sensitizers based on low band gap polymers [55][56][57][58][59][60][61][62][63], small molecules [64][65][66], dyes [67][68][69] and nanoparticles [13][14][15][16][17][18][19][20][21] are employed in the structure of the photoactive layer in combination with donor material which is usually consists of a large bandgap polymer and fullerene derivative as acceptor. Recently, the record PCEs over 12% have been reported for the PBDB-T:IT-M: BisPC 70 BM (1:1:0.2) ternary solar cells with a Jsc=17.3 mA/cm², Voc=0.95 V and FF=74% [42], which demonstrate the potential of ternary sensitization concept for OPVs' upscaling.…”

Section: Ternary Solar Cellsmentioning

confidence: 97%

“…For electron acceptors some polymers such as poly-[2-methoxy- [42], and ICBA [14], and graphene nano sheets [43][44][45] are vastly studied and used. Fullerenes are considered as the most appropriate electron acceptor due to the ultrafast photo induced charge transfer between electron donors and acceptors, high mobility and better phase segregation to create three dimensional (3D) networks for the transportation of electrons to the electrode [46].…”

Section: Common Materialsmentioning

confidence: 99%

Recent Developments in Quantum Dots/CNT Co-Sensitized Organic Solar Cells

Soltani¹,

Katbab²,

Ameri³

2017

J Material Sci Eng

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Polymer solar cells (PSCs) are emerging alternative candidates to the standard silicone technology for green and renewable energy generation owing to their flexibility and solution processability. Bulk heterojunction (BHJ) organic solar cells (OSCs) based on conjugated semiconducting polymers as donor (D) and fullerene derivatives as acceptor (A) offer large D/A interfacial area, which overcomes the short exciton diffusion length. Although, recent advances in narrow band gap semiconducting polymers have led to the improvement in power conversion efficiency of organic photovoltaics (OPVs) beyond 10%, inefficient charge separation and low carrier mobility as well as negligible photon harvesting in near-infrared (NIR) and/or infrared (IR) region of the solar spectrum have still remained as bottle neck for ultimate performance of OPVs. Most PSCs only absorb the UV-visible part of the solar spectrum, leading to the low light harvesting efficiency. Hence, solution processed photoactive materials comprising nanostructured semiconducting inorganic quantum dots (QDs) as sensitizer have attracted great attention to improve energy conversion efficiency of the OPVs. This is attributed to the outstanding optoelectronic properties of QDs such as band gap tunability, potential NIR photons harvesting and multi exciton generation (MEG). However, the main shortcoming of inorganic QDs based OSCs is randomly hopping charge transport among discrete QD particles, which can be tackled through hybridization with one dimensional (1D) electrically conductive nanostructured materials such as carbon nanotube (CNT). By this way, CNT particles would behave as support for anchoring the light harvesting semiconductor QDs, leading to the enhancement of the exciton dissociation and charge transport towards the corresponding electrodes. Recently, manufacturing PSCs co-sensitized by QD loaded CNT has been shown as a promising direction to maximize performance of the device. This article reviews the recent developments in enhancement of OPVs" performance by utilization of high efficient light harvesting QDs and/or their hybrid with 1D CNTs.

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“…The power conversion efficiency of organic solar cells (OSCs) has now reached 11% [1][2][3][4], as a result of intensive efforts on the synthesis of new materials, understanding of device physics, and optimization of device fabrication processes [5][6][7][8][9][10][11]. One of the largest breakthroughs in OSCs is the invention of bulk-heterojunction (BHJ) structure that is a random mixture of donor and acceptor materials [12,13].…”

Section: Keisuke Tajimamentioning

confidence: 99%