Comparative experiments of graphene covalently and physically binding CdSe quantum dots to enhance the electron transport in flexible photovoltaic devices

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 9241-9249 ◽  
Author(s):  
Mi-Hee Jung ◽  
Moo-Jung Chu
Keyword(s):  
Quantum Dots ◽  
Electron Transport ◽  
Covalent Binding ◽  
Cdse Quantum Dots ◽  
Photovoltaic Devices ◽  
Graphene Surface ◽  
Binding System

The covalent binding system of CdSe and graphene effectively transports photoelectrons from the CdSe to the graphene surface.

scholarly journals Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Alfian F. Madsuha ◽  
Akhmad H. Yuwono ◽  
Nofrijon Sofyan ◽  
Michael Krueger
Keyword(s):  
Quantum Dots ◽  
Surface Modification ◽  
Solar Cells ◽  
Solar Cell ◽  
Electron Transport ◽  
Bulk Heterojunction ◽  
Hexanoic Acid ◽  
Cdse Quantum Dots ◽  
Hybrid Solar Cells ◽  
Solar Cell Application

As-synthesized colloidal quantum dots (QDs) are usually covered by an organic capping ligand. These ligands provide colloidal stability by preventing QDs agglomeration. However, their inherent electrical insulation properties deliver a problem for hybrid solar cell application, disrupting charge transfer, and electron transport in conjugated polymer/QDs photoactive blends. Therefore, a surface modification of QDs is crucial before QDs are integrated into solar cell fabrication. In this work, enhancement of power conversion efficiency (PCE) in bulk heterojunction (BHJ) hybrid solar cells based on hexadecylamine- (HDA-) capped CdSe quantum dots (QDs) has been achieved via a postsynthetic hexanoic acid washing treatment. The investigation of the surface modification was performed to find the optimum of washing time and their effect on solar cell devices performance. Variation of washing time between 16 and 30 min has been conducted, and an optimum washing time was found at 22 min, resulting in a high PCE of 2.81%. The efficiency enhancement indicates improved electron transport, contributing in an increased short-circuit current density of solar cell devices.

scholarly journals High-Performance Core/Shell of ZnO/TiO2 Nanowire with AgCl-Doped CdSe Quantum Dots Arrays as Electron Transport Layer for Perovskite Solar Cells

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 3969
Author(s):  
Jin Mo Kim ◽  
Bong Soo Lee ◽  
Sung Won Hwang
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Electron Transport ◽  
Conversion Efficiency ◽  
Perovskite Solar Cells ◽  
Transport Layer ◽  
Atmospheric Environment ◽  
Electron Transport Layer ◽  
Core Shell ◽  
Cdse Quantum Dots

Most previous studies of perovskite core/shell structures have been based on ZnO/TiO2 nanowires (NWs), which are not suitable for high photoelectric conversion efficiency. Here, core/shell ZnO/TiO2 NWs with AgCl-doped CdSe quantum dots were fabricated as an electron transport layer (ETL) for perovskite solar cells, based on ZnO/TiO2 arrays. We designed CdSe with AgCl dopants that were synthesized by a colloidal process. An improvement of the recombination barrier (Rct1), due to shell supplementation with AgCl-doped CdSe quantum dots, improved the open circuit voltage, the fill factor, and the adsorption capacity of CH3NH3PbI3 perovskite with NWs. The enhanced cell steady state was attributable to TiO2 with AgCl-doped CdSe QD supplementation. A maximum power conversion efficiency of 15.12% was attained in an atmospheric environment. The mechanism of the recombination and electron transport in the perovskite solar cells becoming the basis of ZnO/TiO2 core/shell arrays was investigated to represent the merit of ZnO/TiO2 core/shell arrays as an electron transport layer in effective devices. These results showed an uncomplicated approach for restraining non-radiative recombination loss in hetero-structure core/shell arrays to significantly improve perovskite solar cell performance and increase the effectiveness of photovoltaics.

Photosensitization of ZnO Nanowires with CdSe Quantum Dots for Photovoltaic Devices

Nano Letters ◽  
2007 ◽  
Vol 7 (6) ◽  
pp. 1793-1798 ◽  
Author(s):  
Kurtis S. Leschkies ◽  
Ramachandran Divakar ◽  
Joysurya Basu ◽  
Emil Enache-Pommer ◽  
Janice E. Boercker ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Zno Nanowires ◽  
Cdse Quantum Dots ◽  
Photovoltaic Devices

Ultrafast fs coherent excitonic dynamics in CdSe quantum dots assemblies addressed and probed by 2D electronic spectroscopy

2021 ◽  
Vol 154 (1) ◽  
pp. 014301
Author(s):  
Elisabetta Collini ◽  
Hugo Gattuso ◽  
R. D. Levine ◽  
F. Remacle
Keyword(s):  
Quantum Dots ◽  
Electronic Spectroscopy ◽  
Cdse Quantum Dots

scholarly journals One pot synthesis of bi-linker stabilised CdSe quantum dots

2010 ◽  
Vol 245 ◽  
pp. 012067 ◽  
Author(s):  
I Concina ◽  
M M Natile ◽  
A Braga ◽  
A Vomiero ◽  
V Morandi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdse Quantum Dots ◽  
One Pot ◽  
One Pot Synthesis
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