Efficient Polymer Solar Cells Based on a Low Bandgap Semi‐crystalline DPP Polymer‐PCBM Blends

Liu, Feng; Gu, Yu; Wang, Cheng; Zhao, Wei; Chen, Dian; Briseño, Alejandro L.; Russell, Thomas P.

doi:10.1002/adma.201200902

Cited by 212 publications

(201 citation statements)

References 35 publications

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“…[[qv: 1c]],3 These parameters can significantly affect the short‐circuit current density ( J sc ), open‐circuit voltage ( V oc ), and fill factor (FF) of PSCs. In device fabrication, various processing conditions, such as solvent additives, the usage of mixed solvents,4 thermal annealing,5 solvent annealing,6 and postannealing,7 are used to optimize the morphology of BHJ blends. In order to enhance the absorption over 800 nm to improve J sc , much effort has been dedicated to the development of low‐bandgap (LBG) conjugated polymers, typically adopting an alternating donor–acceptor (D–A) repeating unit strategy to tune the bandgap and energy levels by controlling the intramolecular charge transfer (ICT) from the donor (D) to the acceptor (A) moieties.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Polymer Solar Cells Based on a Wide‐Bandgap Polymer Containing Pyrrolo[3,4‐f]benzotriazole‐5,7‐dione with a Power Conversion Efficiency of 8.63%

Lan

Chen

et al. 2016

Advanced Science

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A novel donor–acceptor type conjugated polymer based on a building block of 4,8‐di(thien‐2‐yl)‐6‐octyl‐2‐octyl‐5H‐pyrrolo[3,4‐f]benzotriazole‐5,7(6H)‐dione (TZBI) as the acceptor unit and 4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene as the donor unit, named as PTZBIBDT, is developed and used as an electron‐donating material in bulk‐heterojunction polymer solar cells. The resulting copolymer exhibits a wide bandgap of 1.81 eV along with relatively deep highest occupied molecular orbital energy level of −5.34 eV. Based on the optimized processing conditions, including thermal annealing, and the use of a water/alcohol cathode interlayer, the single‐junction polymer solar cell based on PTZBIBDT:PC71BM ([6,6]‐phenyl‐C71‐butyric acid methyl ester) blend film affords a power conversion efficiency of 8.63% with an open‐circuit voltage of 0.87 V, a short circuit current of 13.50 mA cm−2, and a fill factor of 73.95%, which is among the highest values reported for wide‐bandgap polymers‐based single‐junction organic solar cells. The morphology studies on the PTZBIBDT:PC71BM blend film indicate that a fibrillar network can be formed and the extent of phase separation can be manipulated by thermal annealing. These results indicate that the TZBI unit is a very promising building block for the synthesis of wide‐bandgap polymers for high‐performance single‐junction and tandem (or multijunction) organic solar cells.

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Section: Introductionmentioning

confidence: 99%

High‐Performance Polymer Solar Cells Based on a Wide‐Bandgap Polymer Containing Pyrrolo[3,4‐f]benzotriazole‐5,7‐dione with a Power Conversion Efficiency of 8.63%

Lan

Chen

et al. 2016

Advanced Science

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“…Typically, a high‐performance PSC system will require a multiple‐length scale of phase separation between the donor and the acceptor, which guarantees large specific inner surface area to effectively split excitons and provide bicontinuous pathways for efficient charge carrier transport 6. Choice of processing solvent plays an important role in regulating the morphology of blended thin films, since the solvent not only provides adequate solubility for both the donor and the acceptor but also affects the interactions between them7, 8 and can modulate the crystallinity of the polymer donors 9, 10…”

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confidence: 99%

“…Additives with high boiling points and selective solubilities can dramatically influence the size scale of the phase separation of the components 13, 14, 15. By processing with chlorinated solvents, well‐organized polymers and PCBM domains can be obtained9, 16 and even a vertical gradual‐component‐distributed morphology can be constructed,17, 18 which are beneficial to the carrier transport and extraction.…”

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confidence: 99%

“…To provide a more in‐depth understanding on the morphology formation process during the solvent drying of the BHJ film processed from TMB+1,5‐DMN, the kinetics of the morphology evolution was therefore studied using in situ GIXD 9, 41. PDTSTPD:PC 71 BM blend was blade coated onto PEDOT:PSS coated wafer and a synchrotron X‐ray beam was used to monitor the crystallization of PDTSTPD during solvent evaporation.…”

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confidence: 99%

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Morphology Evolution in High‐Performance Polymer Solar Cells Processed from Nonhalogenated Solvent

et al. 2015

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A new processing protocol based on non‐halogenated solvent and additive is developed to produce polymer solar cells with power conversion efficiencies better than those processed from commonly used halogenated solvent‐additive pair. Morphology studies show that good performance correlates with a finely distributed nanomorphology with a well‐defined polymer fibril network structure, which leads to balanced charge transport in device operation.

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“…Based on enhanced contrast among different components, the characteristic median length (domain spacing) and average compositional fluctuation (domain purity) can be obtained 46, 47, 48, 49, 50, 51 7 shows the scattering profile of ternary blends and binary reference blend at 284.2 eV.…”

Section: Resultsmentioning

confidence: 99%

Understanding the Impact of Hierarchical Nanostructure in Ternary Organic Solar Cells

et al. 2015

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Ternary organic solar cells (OSCs), which blend two donors and fullerene derivatives with different absorption ranges, are a promising potential strategy for high‐power conversion efficiencies (PCEs). In this study, inverted ternary OSCs are fabricated by blending a highly crystalline small molecule BDT‐3T‐CNCOO in a low band gap polymer PBDTTT‐C‐T:PC71BM. As the small molecule is introduced, the overall PCEs increase from 7.60% to 8.58%. The morphologies of ternary blends are studied by combining transmission electron microscopy and X‐ray scattering techniques at different length scales. Hierarchical phase separation is revealed in the ternary blend, which is composed of domains with sizes of ≈88, ≈50, and ≈20 nm, respectively. The hierarchical phase separation balances the charge separation and transport in ternary OSCs. As a result, the fill factors of the devices significantly improve from 58.4% to 71.6%. Thus, ternary blends show higher hole mobility and higher fill factor than binary blends, which demonstrates a facile strategy to increase the performance of OSCs.

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Efficient Polymer Solar Cells Based on a Low Bandgap Semi‐crystalline DPP Polymer‐PCBM Blends

Cited by 212 publications

References 35 publications

High‐Performance Polymer Solar Cells Based on a Wide‐Bandgap Polymer Containing Pyrrolo[3,4‐f]benzotriazole‐5,7‐dione with a Power Conversion Efficiency of 8.63%

High‐Performance Polymer Solar Cells Based on a Wide‐Bandgap Polymer Containing Pyrrolo[3,4‐f]benzotriazole‐5,7‐dione with a Power Conversion Efficiency of 8.63%

Morphology Evolution in High‐Performance Polymer Solar Cells Processed from Nonhalogenated Solvent

Understanding the Impact of Hierarchical Nanostructure in Ternary Organic Solar Cells

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