Small‐Bandgap Polymer Solar Cells with Unprecedented Short‐Circuit Current Density and High Fill Factor

Choi, Hyosung; Ko, Seo Jin; Kim, Taehyo; Morin, Pierre; Walker, Bright; Lee, Byoung Hoon; Leclerc, Mario; Kim, Jin Young; Heeger, Alan J.

doi:10.1002/adma.201501132

Cited by 306 publications

(233 citation statements)

References 38 publications

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“…The results indicate that PBDB-T shows poor solubility in anisole or THF but can be easily dissolved in XY. In order to avoid using a halogenated additive to fabricate the fullerene-free OSCs, we selected three halogen-free solvents as additives, N-methylpyrrolidone (NMP), diphenyl ether (DPE) and 1-phenylnaphthalene (PN), which have been used as solvent additives in the fullerene-based OSCs [14,55,56]. Therefore, in this work, the fullerene-free OSCs based on PBDB-T:IT-M were fabricated with XY as the host solvent, NMP, DPE and PN were selected as the solvent additive to improve the active layer morphology, respectively.…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…The slowest charge carrier mobility is reported to be 2.4 × 10 for DT-PDPP2T-TT/PC 71 BM blend films [17].…”

Section: Bimolecular Recombinationmentioning

confidence: 99%

Reduced Bimolecular Recombination in Polymer Solar Cells

Fukuhara

Osaka

Tamai

et al. 2016

J. Photopol. Sci. Technol.

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Polymer solar cells with a thick active layer can generate large photocurrent because they absorb many more photons. In most cases, however, the active layer is as thin as ~100 nm under the optimized condition. In this work, we have studied bimolecular charge recombination in highly efficient polymer solar cells with a thick active layer by transient photovoltage and photocurrent measurements. As a result, we found that the bimolecular recombination rate is smaller by three orders of magnitude than that predicted from the diffusion-limited Langevin recombination. We therefore conclude that such reduced bimolecular recombination enables efficient charge collection even in the solar cell with a thick active layer.

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“…We fabricated bulk heterojunction (BHJ) PSCs in a conventional architecture of ITO/PEDOT:PSS/polymer:PC 71 BM/Al [7,10,26]. The details for the device fabrication are described in the experimental section.…”

Section: Photovoltaic Propertiesmentioning

confidence: 99%

“…Currently, great advances have been made in organic photovoltaics (OPVs) by development of semi-crystalline low band gap donor-acceptor (D-A) polymers with broad light absorption and high carrier mobility [1][2][3][4]. Fullerene based polymer solar cells (PSCs) already achieved the power conversion efficiencies (PCEs) over ~9-11% [5][6][7][8][9][10]. Given the various photovoltaic polymers reported during the last decade, benzothiadiazole (BT), mono-and difluroinated BT (FBT, 2FBT) have been widely studied and proven to be one of the most promising electron-withdrawing building block to yield D-A type high-performance PSCs [7,8,11].…”

Section: Introductionmentioning

confidence: 99%

Thiophene and Naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole Based Alternating Copolymers for Polymer Solar Cells

Lee

Kim

et al. 2016

J. Photopol. Sci. Technol.

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Two planar type photovoltaic polymers based on naphthobisthiadiazole, poly(2,5-bis(2-hexyldecyloxy)phenylene-alt-(5,10-dithiophen-2-yl)naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole) (hPPDTNTz) and poly(2,5-bis(2-decyltetradecyloxy)phenylene-alt-(5,10-dithiophen-2-yl)naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole) (d-PPDTNTz) were synthesized by incorporating intrachain noncovalent Coulombic interactions in the molecular design. To achieve a delicate balance of molecular weight, solubility as well as bulk film morphology, hexyldecyloxy (h-) and decyltetradecyloxy (d-) side-chains were substituted, which played a decisive role in modulating morphology, film packing structure and macroscopic device properties. Both polymers showed a broad light absorption up to ~800 nm and d-PPDTNTz exhibited a deeper HOMO and preferentially face-on orientation in pristine and blended films with PC71BM. The detailed optical, electrochemical, thermal, morphological and the resulting photovoltaic characteristics were studied. The best power conversion efficiency of ~6.7% was measured for d-PPDTNTz:PC 71 BM, suggesting that the careful choice of side-chains is necessary for fully optimize the photovoltaic materials and devices.

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Small‐Bandgap Polymer Solar Cells with Unprecedented Short‐Circuit Current Density and High Fill Factor

Cited by 306 publications

References 38 publications

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

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

Reduced Bimolecular Recombination in Polymer Solar Cells

Thiophene and Naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole Based Alternating Copolymers for Polymer Solar Cells

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