From Binary to Ternary Solvent: Morphology Fine‐tuning of D/A Blends in PDPP3T‐based Polymer Solar Cells

Ye, Long; Zhang, Shaoqing; Ma, Wei; Fan, Benhu; Guo, Xia; Huang, Ye; Ade, Harald; Hou, Jianhui

doi:10.1002/adma.201202855

Cited by 293 publications

(265 citation statements)

References 46 publications

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“…Design, synthesis and applications of novel conjugated polymers for polymer solar cells (PSCs) have received substantial attention over the past decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Significant improvements have been achieved in understanding the correlations between polymer structure and photovoltaic performance, which have helped to boost the power conversion efficiency (PCE) over 7% in several well-known backbones, such as benzodithiophene (BDT) and thienothiophene (TT) (PBDT-TT) [15][16][17][18][19][20][21][22][23][24][25][26][27][28], BDT and benzothiadiazole (BT) (PBDT-BT) [29,30], BDT and thienopyrroledione (TPD) (PBDT-TPD) [31], etc.…”

Section: Introductionmentioning

confidence: 99%

Influence of the alkyl substitution position on photovoltaic properties of 2D-BDT-based conjugated polymers

Yao

Fan

et al. 2015

Sci. China Mater.

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Section: Introductionmentioning

confidence: 99%

Influence of the alkyl substitution position on photovoltaic properties of 2D-BDT-based conjugated polymers

Yao

Fan

et al. 2015

Sci. China Mater.

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“…The perovskite precursor solution was stirred at 60°C overnight and then filtered using 0.45 μm polytetrafluoroethylene (PTFE) filters prior to use in device fabrication. Experimentally, the processing details of the PDPP3T/ PCBM and PDTP-DFBT/PCBM BHJ absorbers are consistent with the reported methods [40,41,45]. The fabrication procedures for the PPSC devices are as follows: ITO-coated glass substrates were cleaned stepwise in detergent, water, acetone, and isopropyl alcohol under ultrasonication for 15 min each before being subsequently dried in an oven for 30 min.…”

Section: Solar Cell Fabricationmentioning

confidence: 83%

“…After being baked at 150°C for approximately 20 min, the substrates were transferred into a nitrogen-filled glove box (<1 ppm O 2 and H 2 O). Based on our previous work [40,41], a ternary solvent mixture of o-dichlorobenzene (DCB), chloroform (CF) and 1,8-diiodooctane (DIO) is the best solvent system to process the PDPP3T:PCBM photoactive layer [40,41]. This solvent system was also used in this work with an identical volume ratio of 76:19:5.…”

Section: Science China Materialsmentioning

confidence: 99%

Perovskite-polymer hybrid solar cells with near-infrared external quantum efficiency over 40%

Fan

Zhang

et al. 2015

Sci. China Mater.

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an inverted structure (Fig. 1a) of indium tin oxide (ITO)/ poly(3,4-ethylenedioxythiophene) PEDOT: poly(styrenesulfonate) (PSS)/peroskite/ [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/Al(or Ag) [6−19]. For this type of peroskite/PCBM solar cell, generally only photons in the ultraviolet-visible range (300−800 nm) are harvested in the devices due to the medium optical band gap (~1.55 eV) of CH 3 NH 3 PbI 3-x Cl x or CH 3 NH 3 PbI 3 . Solution-processed polymer solar cells utilizing conjugated polymer and PCBM bulk-heterojunction (BHJ) blend as a light absorber are also a promising photovoltaic technology due to tunable absorption features and energy levels, as well as excellent solution processibility of the diverse polymers [20−29]. Therefore, integrating the advantages of both photovoltaic technologies into a simple photovoltaic device will be of great importance to achieve cost-effective and low temperature processed photovoltaic technologies.It is well-established that nanoscale bicontinuous interpenetrating networks in polymer:PCBM BHJ solar cells are beneficial for realizing efficient exciton dissociation and charge transport [30,31]. Very recently, researchers from polymer solar cell community have introduced feasible strategies to push forward planar junction perovskite/ fullerene solar cells [32−36] In the past several years, conjugated polymers and organometal halide perovskites have become regarded as promising light-absorbing materials for next-generation photovoltaic devices and have attracted a great deal of interest. As the main part of this contribution, we describe the enhancement of near-infrared (NIR) photoresponse of well-known CH3NH3PbI3−xClx-based solar cells by the integration of bulk heterojunction (BHJ) small band gap polymer:fullerene absorbers. Particularly, the integration of a commercially available polymer PDPP3T and PCBM-based BHJ boosts the peak external quantum efficiency (EQE) by up to 46% in the NIR region (800−1000 nm), which is outside of the photoresponsive region (300−800 nm) of conventional perovskite solar cells. This substantial improvement in the EQE over the NIR region offers an additional current density of ~5 mA cm −2 for the control perovskite solar cell, and a high power conversion efficiency (PCE) of over 12% was obtained in the perovskite/BHJ-based solar cells. In addition, the insertion of the BHJ absorber consisting of a small band gap polymer PDTP-DFBT and PCBM also results in nearly 40% EQE for the perovskite/BHJ solar cell. The results also reveal that controlling over the polymer/PCBM weight ratio for a BHJ absorber is the key to achieving the optimal efficiency for this type of perovskite-polymer hybrid solar cell.

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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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From Binary to Ternary Solvent: Morphology Fine‐tuning of D/A Blends in PDPP3T‐based Polymer Solar Cells

Cited by 293 publications

References 46 publications

Influence of the alkyl substitution position on photovoltaic properties of 2D-BDT-based conjugated polymers

Influence of the alkyl substitution position on photovoltaic properties of 2D-BDT-based conjugated polymers

Perovskite-polymer hybrid solar cells with near-infrared external quantum efficiency over 40%

Understanding the Impact of Hierarchical Nanostructure in Ternary Organic Solar Cells

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