Journal ArticleDOI
Surface Oxidation as a Cause of High Open-Circuit Voltage in CdSe ETA Solar Cells
Saar Kirmayer,Eran Edri,Douglas A. Hines,Nir Klein-Kedem,Hagai Cohen,Olivia Niitsoo,Iddo Pinkas,Prashant V. Kamat,Gary Hodes +8 more
TLDR
In this paper, annealing in N2-annealed SiO2/CdSe/CuSCN extremely thin absorber (ETA) solar cells are found to give relatively high values of open-circuit voltage (> 0.8 V) but low currents upon anneal the cadmium selenide (CdSE) in air (500 oC).Abstract:
TiO2/CdSe/CuSCN extremely thin absorber (ETA) solar cells are found to give relatively high values of open-circuit voltage (>0.8 V) but low currents upon annealing the cadmium selenide (CdSe) in air (500 oC). Annealing in N2 produces much lower photovoltages and slightly lower photocurrents. Band structure measurements show differences between the two annealing regimes that, however, appear to favor the N2-annealed CdSe. On the other hand, chemically resolved electrical measurements (CREM) of the cells reveal marked differences in photo-induced charge trapping, in particular at absorber grain boundaries of the air versus N2-annealed systems, correlated with the formation of Cd–O species at the CdSe surface. Using transient absorption and photovoltage decay, pronounced lifetime differences are also observed, in agreement with the strong suppression of charge recombination. The results point to a multiple role of grain surface-oxidation, which both impedes electron injection from the CdSe to the TiO2, but, much more significantly, enhances hole injection to the CuSCN via passivation of hole traps that act as efficient recombination centers.read more
Citations
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Journal Article
Colloidal nanocrystal synthesis and the organic-inorganic interface
Yadong Yin,A. Paul Alivisatos +1 more
TL;DR: In this paper, the authors review what is known about nanocrystal growth and outline strategies for controlling it, and present a review of the current state-of-the-art in this area.
Journal ArticleDOI
Charge Recombination Control for High Efficiency Quantum Dot Sensitized Solar Cells
TL;DR: Some effective routes to suppress charge recombination processes, such as adopting preprepared high-quality QD sensitizers, tailoring the electronic properties of QDs, and interface engineering with the use of organic or inorganic thin layer overcoating the sensitized photoanode have been overviewed.
Journal ArticleDOI
A Strategy to Enhance the Efficiency of Quantum Dot-Sensitized Solar Cells by Decreasing Electron Recombination with Polyoxometalate/TiO2 as the Electronic Interface Layer.
TL;DR: Photovoltaic experimental results and the electron transmission mechanism show that the POM/TiO2 electronic interface layer in the QDSCs can clearly suppress electron recombination, increase the electron lifetime, and result in smoother electron transmission.
Journal ArticleDOI
Ultrafast Charge Carrier Dynamics in Extremely Thin Absorber (ETA) Solar Cells Consisting of CdSe-Coated ZnO Nanowires
TL;DR: In this article, transient absorption spectroscopy was employed to measure these ultrafast photophysical processes in CdSe-coated ZnO nanowire ETA cells and model planar films.
Book ChapterDOI
Methods for design and fabrication of nanosensors: the case of ZnO-based nanosensor
LF Gorup,Luís Henrique Cardozo Amorin,Emerson R. Camargo,Thiago Sequinel,Fernando H. Cincotto,Glenda Biasotto,Naomi S. Ramesar,Felipe A. La Porta +7 more
TL;DR: This chapter summarizes some examples of the design and fabrication of nanosensors based on ZnO nanocrystals, potentially serving a diverse range of applications, as described in detail.
References
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Journal ArticleDOI
Hybrid Nanorod-Polymer Solar Cells
TL;DR: It is demonstrated that semiconductor nanorods can be used to fabricate readily processed and efficient hybrid solar cells together with polymers and Tuning the band gap by altering the nanorod radius enabled us to optimize the overlap between the absorption spectrum of the cell and the solar emission spectrum.
Journal ArticleDOI
Colloidal nanocrystal synthesis and the organic–inorganic interface
Yadong Yin,A. Paul Alivisatos +1 more
TL;DR: Colloidal nanocrystals are solution-grown, nanometre-sized, inorganic particles that are stabilized by a layer of surfactants attached to their surface, which makes these structures attractive and promising building blocks for advanced materials and devices.
Colloidal nanocrystal synthesis and the organic-inorganic interface - eScholarship
Yadong Yin,A. Paul Alivisatos +1 more
TL;DR: In this article, the authors review what is known about nanocrystal growth and outline strategies for controlling it, and present a review of the current state-of-the-art in this area.
Journal ArticleDOI
Quantum Dot Solar Cells. Semiconductor Nanocrystals as Light Harvesters
TL;DR: In this paper, three major ways to utilize semiconductor dots in solar cell include (i) metal−semiconductor or Schottky junction photovoltaic cell, (ii) polymer−smiconductor hybrid solar cell, and (iii) quantum dot sensitized solar cell.
Journal ArticleDOI
Beyond Photovoltaics: Semiconductor Nanoarchitectures for Liquid-Junction Solar Cells
TL;DR: One-Dimensional (1-D) Transport Architectures 6675 4.2.1.