Anatase colloidal solutions suitable for inkjet printing: Enhancing lifetime of hybrid organic solar cells

Karpinski, A.; Berson, Solenn; Terrisse, Hélène; Granvalet, Maryline Mancini-Le; Guillerez, S.; Brohan, Luc; Richard‐Plouet, Mireille

doi:10.1016/j.solmat.2013.04.006

Cited by 30 publications

(24 citation statements)

References 38 publications

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“…Although this performance is slightly lower than that of the TeO 2 ‐based device, it is still more efficient than the ITO‐based control device, which demonstrates the microcavity strategy can be generally applicable to other capping materials. Other transparent metal oxides that have suitable optical constants and can be deposited without destroying the underlying layers such as other vacuum evaporation or solution‐processed techniques are also potential capping materials for such microcavity configuration.…”

Section: Parameters Of the Optimized Devices In The Microcavity Confimentioning

confidence: 99%

Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration

et al. 2014

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Organic solar cells often show inefficient light harvesting due to a short absorption path length limited by the low charge mobility of organic semiconductors. We demonstrate a flexible organic solar cell in a microcavity configuration using a TeO2/Ag semitransparent electrode to confine the optical field within the device with significant performance improvements and reaching a power conversion efficiency of 8.56%.

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Section: Parameters Of the Optimized Devices In The Microcavity Confimentioning

confidence: 99%

Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration

et al. 2014

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“…Leong et al observed that the crystallinity of anatase prepared in the reactionb etween TiCl 4 and benzyl alcohol increased when the product was calcined at high temperature. [25] The synthesis of nanosized anatase particles reported [24] in this paper is based on the reflux process of [Ti 8 O 12 (H 2 O) 24 ]Cl 8 ·HCl·7H 2 O, at itanium precursor,i namixture of propylene carbonate (PC) and water.H eating this suspension induces hydrolysis of PC and the formation of propylene glycol (PG), [26] leadingt hen to the nucleation of anatase nanocrystallites. Theo bjective of this work is to optimize the synthesis at low temperatureb yi ncreasing the amountso fc olloidal solution produced and reducing the reaction time, to optimize the potentialscale-upoft he process.…”

Section: Introductionmentioning

confidence: 99%

TiO₂ Anatase Solutions for Electron Transporting Layers in Organic Photovoltaic Cells

et al. 2017

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Reflux of a solution of [Ti O (H O) ]Cl ⋅HCl⋅7 H O as titanium precursor at 120 °C for 24 h leads to a transparent colloidal solution of nanosized crystallized anatase TiO . The adjustment of the particle size and composition of the dispersant is monitored through the initial water content while controlling the conversion of propylene carbonate into propylene glycol during reflux. The solutions were processed as thin films to produce electron transporting layers in hybrid bulk heterojunction solar cells, by using a blend of P3HT:PCBM polymers as absorbers, in inverted architectures. The solutions obtained by reflux were demonstrated to produce suitable electron transporting layers.

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“…where P inc (t) is the solar irradiance as a function of time, t. In Figure 11 we plot E 80 for the previously reported OPVs summarized in Table 2, including the TP70 devices studied here. [7,17,18,[39][40][41][42][43][44][45][46][47] Apparently, both lifetime and PCE have improved over the last several years, producing dramatic increases in E 80 from <10 6 J m −2 in 2005 to 5.9 × 10 8 J m −2 in this work. Some polymer and small molecule cells experience a significant decrease in initial efficiency (known as burn in), presumably due to morphological rearrangement following deposition, or chemical instabilities, although that is not observed in several cells investigated here.…”

Section: Discussionmentioning

confidence: 99%

“…Some polymer and small molecule cells experience a significant decrease in initial efficiency (known as burn in), presumably due to morphological rearrangement following deposition, or chemical instabilities, although that is not observed in several cells investigated here. [14,16,18,45] Among devices with E 80 > 10 8 , only two have PCE > 5%, and only three were aged using lamps with AM1.5G UV content. In all cases, the E 80 for organic solar cells still fall >10 times short of those attained by inorganic solar cells where E 80 > 10 10 J m −2 for Si, CdTe, and CuInGaSe 2 devices, with initial PCE = 13.4% to 20.5% and degradation rates <1.2% per year.…”

Section: Discussionmentioning

confidence: 99%

Reliability of Small Molecule Organic Photovoltaics with Electron‐Filtering Compound Buffer Layers

Burlingame

Song

Ciammaruchi

et al. 2016

Advanced Energy Materials

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influencing the lifetime of OPVs is the buffer layer located between the cathode and the photoactive layer. Buffer layers are used to confine excitons within the charge generation region, tune the optical field intensity within the active region, protect the active layer from damage during metal cathode deposition, [8] and transport charge to the appropriate electrode. [9,10] Recently, a class of electron-filtering compound buffer layers (EF-CBLs) has been introduced that simultaneously achieve high conductivity and efficient exciton blocking by blending a wide energy gap and electrically insulating exciton blocking molecule with a conductive fullerene. [3,8] These improvements result in high fill factors (FF) and PCE even at light intensities exceeding one sun (1 kW m −2). [8] The impact of such buffers on device operational lifetime has shown promise, [11] but has yet to be explored in conjunction with stable, blended active-layer OPVs. Accelerated aging can provide valuable insights into the processes underlying device degradation. [12-15] The longest-lived OPV cells now take more than a year to degrade to 80% of their initial PCE under one sun illumination, making conventional lifetime testing increasingly impractical. [16-18] In complex OPVs, optimization must occur across a large device architectural and materials space, thereby highlighting the importance of developing accurate methodologies for accelerating and understanding degradation. Exposure to elevated temperature, Electron-filtering compound buffer layers (EF-CBLs) improve charge extraction in organic photovoltaic cells (OPVs) by blending an electronconducting fullerene with a wide energy gap exciton-blocking molecule. It is found that devices with EF-CBLs with high glass transition temperatures and a low crystallization rate produce highly stable morphologies and devices. The most stable OPVs employ 1:1 2,2′,2″-(1,3,5-benzenetriyl tris-[1-phenyl-1H-benzimidazole] TPBi:C 70 buffers that lose <20% of their initial power conversion efficiency of 6.6 ± 0.6% after 2700 h under continuous simulated AM1.5G illumination, and show no significant degradation after 100 days of outdoor aging. When exposed to 100-sun (100 kW m −2) concentrated solar illumination for 5 h, their power conversion efficiencies decrease by <8%. Moreover, it is found that the reliability of the devices employing stable EF-CBLs has either reduced or no dependence on operating temperature up to 130 °C compared with BPhen:C 60 devices whose fill factors show thermally activated degradation. The robustness of TPBi:C 70 devices under extreme aging conditions including outdoor exposure, high temperature, and concentrated illumination is promising for the future of OPV as a stable solar cell technology.

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Anatase colloidal solutions suitable for inkjet printing: Enhancing lifetime of hybrid organic solar cells

Cited by 30 publications

References 38 publications

Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration

Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration

TiO₂ Anatase Solutions for Electron Transporting Layers in Organic Photovoltaic Cells

Reliability of Small Molecule Organic Photovoltaics with Electron‐Filtering Compound Buffer Layers

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Anatase colloidal solutions suitable for inkjet printing: Enhancing lifetime of hybrid organic solar cells

Cited by 30 publications

References 38 publications

Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration

Strong Photocurrent Enhancements in Highly Efficient Flexible Organic Solar Cells by Adopting a Microcavity Configuration

TiO2 Anatase Solutions for Electron Transporting Layers in Organic Photovoltaic Cells

Reliability of Small Molecule Organic Photovoltaics with Electron‐Filtering Compound Buffer Layers

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TiO₂ Anatase Solutions for Electron Transporting Layers in Organic Photovoltaic Cells