Hybrid zinc oxide/graphene electrodes for depleted heterojunction colloidal quantum-dot solar cells

Physical Chemistry Chemical Physics : PCCP
Mohammad Mahdi TavakoliZhiyong Fan

Abstract

Recently, hybrid nanocomposites consisting of graphene/nanomaterial heterostructures have emerged as promising candidates for the fabrication of optoelectronic devices. In this work, we have employed a facile and in situ solution-based process to prepare zinc oxide/graphene quantum dots (ZnO/G QDs) in a hybrid structure. The prepared hybrid dots are composed of a ZnO core, with an average size of 5 nm, warped with graphene nanosheets. Spectroscopic studies show that the graphene shell quenches the photoluminescence intensity of the ZnO nanocrystals by about 72%, primarily due to charge transfer reactions and static quenching. A red shift in the absorption peak is also observed. Raman spectroscopy determines G-band splitting of the graphene shell into two separated sub-bands (G(+), G(-)) caused by the strain induced symmetry breaking. It is shown that the hybrid ZnO/G QDs can be used as a counter-electrode for heterojunction colloidal quantum-dot solar cells for efficient charge-carrier collection, as evidenced by the external quantum efficiency measurement. Under the solar simulated spectrum (AM 1.5G), we report enhanced power conversion efficiency (35%) with higher short current circuit (80%) for lead sulfide-based solar cells...Continue Reading

References

Jan 11, 2005·Nature Materials·Steven A McDonaldEdward H Sargent
Jun 15, 2006·Journal of the American Chemical Society·Sandip NiyogiRobert C Haddon
Mar 3, 2007·Nature Materials·A K Geim, K S Novoselov
Jul 26, 2008·Nature Nanotechnology·Phaedon AvourisVasili Perebeinos
Nov 28, 2009·Small·Virginia Yong, James M Tour
Dec 5, 2009·Chemical Reviews·Dmitri V TalapinElena V Shevchenko
Apr 3, 2012·ACS Nano·Jianbo Gao, Justin C Johnson
May 9, 2012·Nature Nanotechnology·Gerasimos KonstantatosFrank H L Koppens
May 29, 2012·Nature Nanotechnology·Dong Ick SonWon Kook Choi
Jul 31, 2012·Nature Nanotechnology·Alexander H IpEdward H Sargent
Jan 8, 2013·Advanced Materials·Xinzheng LanEdward H Sargent
Jul 17, 2013·ACS Applied Materials & Interfaces·Kim Truc NguyenYanli Zhao
Feb 25, 2014·Journal of the American Chemical Society·Zonglong ZhuShihe Yang
May 14, 2014·Physical Chemistry Chemical Physics : PCCP·Michael EckMichael Krüger
Jun 9, 2014·Nature Materials·Zhijun NingEdward H Sargent
Dec 31, 2014·Nano Letters·André J LabelleEdward H Sargent

❮ Previous
Next ❯

Citations

Apr 15, 2016·Physical Chemistry Chemical Physics : PCCP·Mohammad Mahdi TavakoliAbdolreza Simchi
Nov 23, 2019·Nanoscale·Hadi Tavakoli DastjerdiMohammad Mahdi Tavakoli
Mar 11, 2020·Chemistry : a European Journal·Arpita Jana, Duncan Gregory
Jan 2, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Arpita Jana, Elke Scheer
Sep 9, 2021·Chemical Society Reviews·Sebastiano BellaniFrancesco Bonaccorso

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.