scholarly journals Charge-transfer dynamics at the dye–semiconductor interface of photocathodes for solar energy applications

2017 ◽  
Vol 198 ◽  
pp. 449-461 ◽  
Author(s):  
Fiona A. Black ◽  
Christopher J. Wood ◽  
Simbarashe Ngwerume ◽  
Gareth H. Summers ◽  
Ian P. Clark ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Solar Energy ◽  
Photophysical Properties ◽  
Redox Couple ◽  
Semiconductor Interface ◽  
Energy Applications ◽  
Dye Regeneration ◽  
Transient Spectroscopy ◽  
Charge Transfer Dynamics ◽  
P Type

This article describes a comparison between the photophysical properties of two charge-transfer dyes adsorbed onto NiO via two different binding moieties. Transient spectroscopy measurements suggest that the structure of the anchoring group affects both the rate of charge recombination between the dye and NiO surface and the rate of dye regeneration by an iodide/triiodide redox couple. This is consistent with the performance of the dyes in p-type dye sensitised solar cells. A key finding was that the recombination rate differed in the presence of the redox couple. These results have important implications on the study of electron transfer at dye|semiconductor interfaces for solar energy applications.

Cost Effective Synthesis and Fabrication of Phase-Pure Kesterite Cu2-xZn1.3SnS4 P-type Absorber Layer Thin Films by Solvent Based Process Technique for Photovoltaic Solar Energy Applications

2018 ◽  
Vol 7 (4) ◽  
pp. 36
Author(s):  
B. Khadambari ◽  
S. S. Bhattacharya
Keyword(s):  
Solar Energy ◽  
Renewable Energy Sources ◽  
Cost Effective ◽  
Absorber Layer ◽  
Window Layer ◽  
Energy Applications ◽  
Process Technique ◽  
Absorber Material ◽  
Effective Synthesis ◽  
P Type

Solar has become one of the fastest growing renewable energy sources. With the push towards sustainability it is an excellent solution to resolve the issue of our diminishing finite resources. Alternative photovoltaic systems are of much importance to utilize solar energy efficiently. The Cu-chalcopyrite compounds CuInS2 and CuInSe2 and their alloys provide absorber material of high absorption coefficients of the order of 105 cm-1. Cu2ZnSnS4 (CZTS) is more promising material for photovoltaic applications as Zn and Sn are abundant materials of earth’s crust. Further, the preparation of CZTS-ink facilitates the production of flexible solar cells. The device can be designed with Al doped ZnO as the front contact, n-type window layer (e.g. intrinsic ZnO); an n-type thin film buffer layer (e.g. CdS) and a p-type CZTS absorber layer with Molybdenum (Mo) substrate as back contact. In this study, CZTS films were synthesized by a non-vaccum solvent based process technique from a molecular-ink using a non toxic eco-friendly solvent dimethyl sulfoxide (DMSO). The deposited CZTS films were optimized and characterized by XRD, UV-visible spectroscopy and SEM.

Valence Band Edge Shifts and Charge-transfer Dynamics in Li-Doped NiO Based p-type DSSCs

2016 ◽  
Vol 188 ◽  
pp. 309-316 ◽  
Author(s):  
Lifang Wei ◽  
Linpeng Jiang ◽  
Shuai Yuan ◽  
Xin Ren ◽  
Yin Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Valence Band ◽  
Band Edge ◽  
Valence Band Edge ◽  
Charge Transfer Dynamics ◽  
P Type

scholarly journals CuSCN Nanowires as Electrodes for p-Type Quantum Dot Sensitized Solar Cells: Charge Transfer Dynamics and Alumina Passivation

2018 ◽  
Vol 122 (9) ◽  
pp. 5161-5170 ◽  
Author(s):  
Muhammad T. Sajjad ◽  
Jinhyung Park ◽  
Dorian Gaboriau ◽  
Jonathon R. Harwell ◽  
Fabrice Odobel ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Quantum Dot ◽  
Charge Transfer Dynamics ◽  
P Type ◽  
Sensitized Solar Cells

Charge transfer dynamics in CsPbBr3 perovskite quantum dots–anthraquinone/fullerene (C60) hybrids

Nanoscale ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 862-869 ◽  
Author(s):  
Sadananda Mandal ◽  
Lijo George ◽  
Nikolai V. Tkachenko
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Organic Molecules ◽  
Photophysical Properties ◽  
Fullerene C60 ◽  
Colloidal Quantum Dots ◽  
Perovskite Quantum Dots ◽  
Charge Transfer Dynamics

An advantage of colloidal quantum dots, particularly perovskite quantum dots (PQDs), as photoactive components is that they easily form complexes with functional organic molecules, which results in hybrids with enriched photophysical properties.

scholarly journals Photocathodes beyond NiO: charge transfer dynamics in a π-conjugated polymer functionalized with Ru photosensitizers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ruri A. Wahyuono ◽  
Bianca Seidler ◽  
Sebastian Bold ◽  
Andrea Dellith ◽  
Jan Dellith ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transient Absorption ◽  
Electrochemical Techniques ◽  
Conductive Polymer ◽  
Transient Absorption Spectroscopy ◽  
Hole Injection ◽  
Polymer Backbone ◽  
Electrolyte Interface ◽  
Charge Transfer Dynamics ◽  
P Type

AbstractA conductive polymer (poly(p-phenylenevinylene), PPV) was covalently modified with RuII complexes to develop an all-polymer photocathode as a conceptual alternative to dye-sensitized NiO, which is the current state-of-the-art photocathode in solar fuels research. Photocathodes require efficient light-induced charge-transfer processes and we investigated these processes within our photocathodes using spectroscopic and spectro-electrochemical techniques. Ultrafast hole-injection dynamics in the polymer were investigated by transient absorption spectroscopy and charge transfer at the electrode–electrolyte interface was examined with chopped-light chronoamperometry. Light-induced hole injection from the photosensitizers into the PPV backbone was observed within 10 ps and the resulting charge-separated state (CSS) recombined within ~ 5 ns. This is comparable to CSS lifetimes of conventional NiO-photocathodes. Chopped-light chronoamperometry indicates enhanced charge-transfer at the electrode–electrolyte interface upon sensitization of the PPV with the RuII complexes and p-type behavior of the photocathode. The results presented here show that the polymer backbone behaves like classical molecularly sensitized NiO photocathodes and operates as a hole accepting semiconductor. This in turn demonstrates the feasibility of all-polymer photocathodes for application in solar energy conversion.

Role of the Triiodide/Iodide Redox Couple in Dye Regeneration in p-Type Dye-Sensitized Solar Cells

Langmuir ◽  
2012 ◽  
Vol 28 (15) ◽  
pp. 6485-6493 ◽  
Author(s):  
Elizabeth A. Gibson ◽  
Loïc Le Pleux ◽  
Jérôme Fortage ◽  
Yann Pellegrin ◽  
Errol Blart ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Redox Couple ◽  
Dye Sensitized ◽  
Dye Regeneration ◽  
P Type ◽  
Sensitized Solar Cells

Single-molecule charge transfer dynamics in dye-sensitized p-type NiO solar cells: influences of insulating Al2O3layers

2012 ◽  
Vol 3 (2) ◽  
pp. 370-379 ◽  
Author(s):  
Zhenfeng Bian ◽  
Takashi Tachikawa ◽  
Shi-Cong Cui ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Single Molecule ◽  
Dye Sensitized ◽  
Charge Transfer Dynamics ◽  
P Type

Spectrum of Defect States in Porous Organic Low-k Dielectric Films, Annealed in Argon and Nitrogen

2003 ◽  
Vol 766 ◽  
Author(s):  
V. Ligatchev ◽  
T.K.S. Wong ◽  
T.K. Goh ◽  
Rusli Suzhu Yu
Keyword(s):  
Deep Level ◽  
Dielectric Films ◽  
Silicon Substrates ◽  
Reverse Bias Voltage ◽  
Defect States ◽  
Single Side ◽  
Sandwich Type ◽  
Transient Spectroscopy ◽  
P Type ◽  
Spectrum Deconvolution

AbstractDefect spectrum N(E) of porous organic dielectric (POD) films is studied with capacitance deep-level-transient-spectroscopy (C-DLTS) in the energy range up to 0.7 eV below conduction band bottom Ec. The POD films were prepared by spin coating onto 200mm p-type (1 – 10 Δcm) single-side polished silicon substrates followed by baking at 325°C on a hot plate and curing at 425°C in furnace. The film thickness is in the 5000 – 6000 Å range. The ‘sandwich’ -type NiCr/POD/p-Si/NiCr test structures showed both rectifying DC current-voltage characteristics and linear 1/C2 vs. DC reverse bias voltage. These confirm the applicability of the C-DLTS technique for defect spectrum deconvolution and the n-type conductivity of the studied films. Isochronal annealing (30 min in argon or 60 min in nitrogen) has been performed over the temperature range 300°C - 650°C. The N(E) distribution is only slightly affected by annealing in argon. However, the distribution depends strongly on the annealing temperature in nitrogen ambient. A strong N(E) peak at Ec – E = 0.55 – 0.60 eV is detected in all samples annealed in argon but this peak is practically absent in samples annealed in nitrogen at Ta < 480°C. On the other hand, two new peaks at Ec – E = 0.12 and 0.20 eV appear in the N(E) spectrum of the samples annealed in nitrogen at Ta = 650°C. The different features of the defect spectrum are attributed to different interactions of argon and nitrogen with dangling carbon bonds on the intra-pore surfaces.

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