Water-soluble polythiophene∕nanocrystalline TiO2 solar cells

Qiao, Qiquan; McLeskey, James T.

doi:10.1063/1.1900300

Cited by 128 publications

(161 citation statements)

References 19 publications

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“…From the literature, the HOMO and LUMO levels of PTEBS were À4.7 to À5.1 and À2.7 to À3.1 eV, respectively. [54] Therefore, the difference between the HOMO of PTEBS and the LUMO of polymer 1 is 1.1 to 1.6 V, which agrees well with the observed V oc values.…”

Section: à2supporting

confidence: 78%

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Layer‐by‐Layer Deposition of Rhenium‐Containing Hyperbranched Polymers and Fabrication of Photovoltaic Cells

Tse

Man

Cheng

et al. 2006

Chemistry A European J

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Multilayer thin films were prepared by the layer‐by‐layer (LBL) deposition method using a rhenium‐containing hyperbranched polymer and poly[2‐(3‐thienyl)ethoxy‐4‐butylsulfonate] (PTEBS). The radii of gyration of the hyperbranched polymer in solutions with different salt concentrations were measured by laser light scattering. A significant decrease in molecular size was observed when sodium trifluoromethanesulfonate was used as the electrolyte. The conditions of preparing the multilayer thin films by LBL deposition were studied. The growth of the multilayer films was monitored by absorption spectroscopy and spectroscopic ellipsometry, and the surface morphologies of the resulting films were studied by atomic force microscopy. When the pH of a PTEBS solution was kept at 6 and in the presence of salt, polymer films with maximum thickness were obtained. The multilayer films were also fabricated into photovoltaic cells and their photocurrent responses were measured upon irradiation with simulated air mass (AM) 1.5 solar light. The open‐circuit voltage, short‐circuit current, fill factor, and power conversion efficiency of the devices were 1.2 V, 27.1 μ A cm−2, 0.19, and 6.1×10−3 %, respectively. The high open‐circuit voltage was attributed to the difference in the HOMO level of the PTEBS donor and the LUMO level of the hyperbranched polymer acceptor. A plot of incident photon‐to‐electron conversion efficiency versus wavelength also suggests that the PTEBS/hyperbranched polymer junction is involved in the photosensitization process, in which a maximum was observed at approximately 420 nm. The relatively high capacitance, determined from the measured photocurrent rise and decay profiles, can be attributed to the presence of large counter anions in the polymer film.

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Section: à2supporting

confidence: 78%

“…The use of PTEBS as donor in polymer/TiO 2 -type solar cells is known. [54] A similar V oc value (1.18 V) was also measured in device 4. However, devices 1 and 3, in which the multilayers were deposited in the absence of salt, exhibited much lower V oc values (0.7 and 0.5 V, respectively).…”

Section: à2supporting

confidence: 63%

Layer‐by‐Layer Deposition of Rhenium‐Containing Hyperbranched Polymers and Fabrication of Photovoltaic Cells

Tse

Man

Cheng

et al. 2006

Chemistry A European J

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“…The results are in agreement with the report of McLeskey's group. 12 However, for the device with a CuPc layer of 20 nm thickness, the results demonstrate substantially improved device performance: J SC increases to 2.22 mA/ cm 2 , which is twice as much as that without CuPc, FF increases to 0.45, while V oc increases to 0.66 V. The corresponding is 0.66%, which has more than twice increase in comparison with the corresponding TiO 2 / P3HT cells. Since more excitons are generated under illumination using CuPc layer, the photocurrent increases notably.…”

mentioning

confidence: 80%

Performance improvement of TiO2∕P3HT solar cells using CuPc as a sensitizer

Shen

Zhu

Tao

et al. 2008

Applied Physics Letters

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In this work, a new type of TiO 2 /polymer solar cells was fabricated. The device structure was indium tin oxide titanium dioxide ͑TiO 2 ͒/ copper phthalocyanine ͑CuPc͒/poly͑3-hexylthiophene͒ ͑P3HT͒/Au. In this architecture, TiO 2 was designed to act as electron acceptor, and P3HT was electron donor. CuPc was used as a sensitizer to enhance photon absorption. The results show that by inserting CuPc between P3HT and TiO 2 layers, the light absorption, excitons separation, and photocurrent under illumination are dramatically improved. The device has a short current density ͑J SC ͒ of 1.15 mA/ cm 2 and power conversion efficiency ͑ ͒ of 0.28% without CuPc layer. However, J SC and turn to be 2.22 mA/ cm 2 and 0.66%, respectively, with a 20 nm thickness CuPc layer under air mass 1.5 global ͑AM1.5G͒ illumination with the intensity of 100 mW/ cm 2 . The performance improvement can be attributed to the higher carrier mobility and the stronger photon absorption using CuPc as a sensitizing layer.

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“…The nanoscale morphology of the DA blend plays a crucial role in determining the photovoltaic performance of the device. [3][4][5][6][7][8][9] A blend of poly(3-hexylthiophene) (P3HT) as donor and phenyl-C 61 -butyric acid methyl ester (PCBM) as acceptor has been studied extensively as a prototypical BHJ cell, with reported efficiencies up to 5%. 10,11 In an ideal scenario, phase separation in the blend should lead to the formation of an interpenetrating bicontinuous network of DA materials.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] The active layer of BHJ solar cells consists of a blend of donor and acceptor materials in a single layer of two conjugated polymers, 4,5 a combination of conjugated polymer and fullerene, [3][4][5][6][7] or a blend of polymer and inorganic nanocrystals. 8,9 Under illumination excitons are generated primarily in the donor material. The excitons diffuse to the donor-acceptor (DA) interfaces where they dissociate, leading to formation of free electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

Connecting physical properties of spin-casting solvents with morphology, nanoscale charge transport, and device performance of poly(3-hexylthiophene):phenyl-C<sub>61</sub>-butyric acid methyl ester bulk heterojunction solar cells

et al. 2011

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Abstract.The correlation between the physical properties of spin-casting solvents, film morphology, nanoscale charge transport, and device performance was studied in poly(3-hexylthiophene):phenyl-C 61 -butyric acid methyl ester (P3HT:PCBM) blends, spin cast with two halogenated aromatic solvents: chlorobenzene (CB) and ortho-dichlorobenzene (1,2-DCB). 1,2-DCB-based blends exhibited fine phase separation of ∼10 to 15 nm length scale with ordered self-assembly of P3HT whereas blends spin cast from CB showed coarse phase separation with large isolated clusters of ∼25 to 100 nm of donor-and acceptor-rich regions. Higher solubility of both P3HT and PCBM in 1,2-DCB and a slower drying rate of 1,2-DCB (because of higher boiling point) facilitated self-organization and ordering of P3HT and promoted finer phase separation. Higher local hole mobility in 1,2-DCB-based blend was attributed to efficient hole transport through the ordered network of P3HT chains. Moreover, higher local illuminated current (dark + photocurrent) in 1,2-DCB-based blend suggested efficient diffusion and dissociation of excitons due to finer phase separation. As a consequence, 1,2-DCB-based devices exhibited higher short circuit current density (J sc ), external quantum efficiency and power conversion efficiency in contrast to the CB-based device. It was also observed that the device performance was not limited by light absorption and exciton generation; rather morphology dependent processes subsequent to exciton generation, primarily charge transport to the electrodes, limited device performance. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

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Water-soluble polythiophene∕nanocrystalline TiO2 solar cells

Cited by 128 publications

References 19 publications

Layer‐by‐Layer Deposition of Rhenium‐Containing Hyperbranched Polymers and Fabrication of Photovoltaic Cells

Layer‐by‐Layer Deposition of Rhenium‐Containing Hyperbranched Polymers and Fabrication of Photovoltaic Cells

Performance improvement of TiO2∕P3HT solar cells using CuPc as a sensitizer

Connecting physical properties of spin-casting solvents with morphology, nanoscale charge transport, and device performance of poly(3-hexylthiophene):phenyl-C<sub>61</sub>-butyric acid methyl ester bulk heterojunction solar cells

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