Journal ArticleDOI
Nanowire dye-sensitized solar cells
Matt Law,Lori E. Greene,Lori E. Greene,Justin C. Johnson,Richard J. Saykally,Peidong Yang,Peidong Yang +6 more
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TLDR
This work introduces a version of the dye-sensitized cell in which the traditional nanoparticle film is replaced by a dense array of oriented, crystalline ZnO nanowires, which features a surface area up to one-fifth as large as a nanoparticle cell.Abstract:
Excitonic solar cells1—including organic, hybrid organic–inorganic and dye-sensitized cells (DSCs)—are promising devices for inexpensive, large-scale solar energy conversion. The DSC is currently the most efficient2 and stable3 excitonic photocell. Central to this device is a thick nanoparticle film that provides a large surface area for the adsorption of light-harvesting molecules. However, nanoparticle DSCs rely on trap-limited diffusion for electron transport, a slow mechanism that can limit device efficiency, especially at longer wavelengths. Here we introduce a version of the dye-sensitized cell in which the traditional nanoparticle film is replaced by a dense array of oriented, crystalline ZnO nanowires. The nanowire anode is synthesized by mild aqueous chemistry and features a surface area up to one-fifth as large as a nanoparticle cell. The direct electrical pathways provided by the nanowires ensure the rapid collection of carriers generated throughout the device, and a full Sun efficiency of 1.5% is demonstrated, limited primarily by the surface area of the nanowire array.read more
Citations
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Green synthesis of graphene nanosheets/ZnO composites and electrochemical properties
Jun Wang,Jun Wang,Zan Gao,Zan Gao,Zhanshuang Li,Bin Wang,Yanxia Yan,Qi Liu,Tom Mann,Milin Zhang,Milin Zhang,Zhaohua Jiang +11 more
TL;DR: In this article, a green and facile approach was demonstrated to prepare graphene nanosheets/ZnO composites for supercapacitor materials, where small ZnO particles successfully anchored onto graphene sheets as spacers to keep the neighboring sheets separate.
Journal ArticleDOI
Using electrochemical methods to study the promotion mechanism of the photoelectric conversion performance of Ag-modified mesoporous g-C3N4 heterojunction material
Yuyu Bu,Zhuoyuan Chen,Weibing Li +2 more
TL;DR: In this article, a photo-assisted reduction of mesoporous graphitic carbon nitride (mg-C3N4) with silver nanoparticles was studied. And the results showed that small nanoparticles are much more effective than larger ones in improving photoelectric conversion performance.
Journal ArticleDOI
Device-Scale Perpendicular Alignment of Colloidal Nanorods
Jessica L. Baker,Asaph Widmer-Cooper,Michael F. Toney,Phillip L. Geissler,A. Paul Alivisatos +4 more
TL;DR: Through drying-mediated self-assembly, this work achieves unprecedented control over orientational order (up to 96% vertically oriented rods on 1 cm(2) areas) on a wide range of substrates (ITO, PEDOT:PSS, Si(3)N(4)).
Journal ArticleDOI
Platinum nanoparticle decorated silicon nanowires for efficient solar energy conversion.
TL;DR: High-density aligned n-type silicon nanowire arrays decorated with discrete 5-10 nm platinum nanoparticles (PtNPs) have been fabricated by aqueous electroless Si etching followed by an electroless platinum deposition process and shown to be a promising hybrid system for solar energy conversion.
Journal ArticleDOI
TiO2/BiVO4 Nanowire Heterostructure Photoanodes Based on Type II Band Alignment
Joaquin Resasco,Hao Zhang,Nikolay Kornienko,Nigel Becknell,Hyunbok Lee,Jinghua Guo,Alejandro L. Briseno,Peidong Yang +7 more
TL;DR: Electrochemical and spectroscopic measurements provide experimental evidence for the type II band alignment necessary for favorable electron transfer from BiVO4 to TiO2, and the host–guest nanowire architecture presented here allows for simultaneously high light absorption and carrier collection efficiency.
References
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Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
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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
Engineering of Efficient Panchromatic Sensitizers for Nanocrystalline TiO2-Based Solar Cells
Mohammad Khaja Nazeeruddin,Peter Pechy,Thierry Renouard,Shaik M. Zakeeruddin,Robin Humphry-Baker,Pascal Comte,Paul Liska,Le Cevey,E Costa,Valery Shklover,Leone Spiccia,Glen B. Deacon,Carlo Alberto Bignozzi,Michael Grätzel +13 more
TL;DR: The black dye, when anchored to nanocrystalline TiO(2) films achieves very efficient sensitization over the whole visible range extending into the near-IR region up to 920 nm, yielding over 80% incident photon-to-current efficiencies (IPCE).
Journal ArticleDOI
Low-temperature wafer-scale production of ZnO nanowire arrays.
Lori E. Greene,Matt Law,Joshua E. Goldberger,Franklin Kim,Justin C. Johnson,Yanfeng Zhang,Richard J. Saykally,Peidong Yang +7 more
TL;DR: A low-temperature, large-scale, and versatile synthetic process is needed before ZnO nanowire arrays find realistic applications in solar energy conversion, light emission, and other promising areas, and the ease of commercial scale-up is presented.
Journal ArticleDOI
A stable quasi-solid-state dye-sensitized solar cell with an amphiphilic ruthenium sensitizer and polymer gel electrolyte.
Peng Wang,Shaik M. Zakeeruddin,Jacques-E. Moser,Mohammad Khaja Nazeeruddin,Takashi Sekiguchi,Michael Grätzel +5 more
TL;DR: A DSC with unprecedented stable performance under both thermal stress and soaking with light, matching the durability criteria applied to silicon solar cells for outdoor applications is shown, fostering widespread practical application of dye-sensitized solar cells.