Cryogenically probing the surface trap states of single nanowires passivated with self-assembled molecular monolayers

Nanoscale ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 82-86 ◽  
Author(s):  
Xingyan Zhao ◽  
Peng Tu ◽  
Jiajing He ◽  
Hong Zhu ◽  
Yaping Dan
Keyword(s):  
Trap States ◽  
Surface Trap ◽  
Molecular Monolayers ◽  
Cryogenic Technique ◽  
Single Nanowires ◽  
Self Assembled

We demonstrate a cryogenic technique that is capable of measuring the density of surface trap states in the full half bandgap without the exponential transient photoresponse assumption.

Facet-Dependent Surface Trap States and Carrier Lifetimes of Silicon

Nano Letters ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 1952-1958 ◽  
Author(s):  
Chih-Shan Tan ◽  
Yicheng Zhao ◽  
Rong-Hao Guo ◽  
Wei-Tsung Chuang ◽  
Lih-Juann Chen ◽  
...  
Keyword(s):  
Trap States ◽  
Surface Trap ◽  
Carrier Lifetimes

scholarly journals Energetics of Nonradiative Surface Trap States in Nanoparticles Monitored by Time-of-Flight Photoconduction Measurements on Nanoparticle–Polymer Blends

2019 ◽  
Vol 11 (40) ◽  
pp. 37184-37192
Author(s):  
Xiaoqing Guo ◽  
Qianxun Gong ◽  
Joanna Borowiec ◽  
Sijie Zhang ◽  
Shuo Han ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Time Of Flight ◽  
Trap States ◽  
Surface Trap

Linear hydrogen adsorbate structures on graphite induced by self-assembled molecular monolayers

Carbon ◽  
2012 ◽  
Vol 50 (5) ◽  
pp. 2052-2056 ◽  
Author(s):  
Louis Nilsson ◽  
Željko Šljivančanin ◽  
Richard Balog ◽  
Wei Xu ◽  
Trolle R. Linderoth ◽  
...  
Keyword(s):  
Molecular Monolayers ◽  
Self Assembled

scholarly journals Mechanisms of triplet energy transfer across the inorganic nanocrystal/organic molecule interface

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Xiao Luo ◽  
Yaoyao Han ◽  
Zongwei Chen ◽  
Yulu Li ◽  
Guijie Liang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Charge Transfer ◽  
Organic Molecule ◽  
Transient Absorption ◽  
High Energy ◽  
Model Systems ◽  
Trap States ◽  
Triplet Energy ◽  
Surface Trap ◽  
Triplet Energy Transfer

AbstractThe mechanisms of triplet energy transfer across the inorganic nanocrystal/organic molecule interface remain poorly understood. Many seemingly contradictory results have been reported, mainly because of the complicated trap states characteristic of inorganic semiconductors and the ill-defined relative energetics between semiconductors and molecules used in these studies. Here we clarify the transfer mechanisms by performing combined transient absorption and photoluminescence measurements, both with sub-picosecond time resolution, on model systems comprising lead halide perovskite nanocrystals with very low surface trap densities as the triplet donor and polyacenes which either favour or prohibit charge transfer as the triplet acceptors. Hole transfer from nanocrystals to tetracene is energetically favoured, and hence triplet transfer proceeds via a charge separated state. In contrast, charge transfer to naphthalene is energetically unfavourable and spectroscopy shows direct triplet transfer from nanocrystals to naphthalene; nonetheless, this “direct” process could also be mediated by a high-energy, virtual charge-transfer state.

Chemical-Solution Deposition of Hafnia Films on Self-Assembled Molecular Monolayers

2006 ◽  
Vol 2 (1) ◽  
pp. 13-32 ◽  
Author(s):  
Michael Hu ◽  
Amy DeBaillie ◽  
Yayi Wei ◽  
Gerold Jellison
Keyword(s):  
Chemical Solution Deposition ◽  
Chemical Solution ◽  
Solution Deposition ◽  
Molecular Monolayers ◽  
Self Assembled

scholarly journals Improvement of Dye Solar Cell Efficiency by Photoanode Posttreatment

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Tanja Ivanovska ◽  
Zoran Saponjic ◽  
Marija Radoicic ◽  
Luca Ortolani ◽  
Vittorio Morandi ◽  
...  
Keyword(s):  
Dye Sensitized Solar Cells ◽  
Trap States ◽  
Electron Recombination ◽  
Electron Hole ◽  
Surface Trap ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Hole Recombination

The basic concept for efficiency improvement in dye-sensitized solar cells (DSSC) is limiting the electron-hole recombination. One way to approach the problem is to improve the photogenerated charge carriers lifetime and consequently reduce their recombination probability. We are reporting on a facile posttreatment of the mesoporous photoanode by using a colloidal solution of TiO2nanoparticles. We have investigated the outcome of the different sintering temperature of the posttreated photoanodes on their morphology as well as on the conversion efficiency of the DSSC. The DSSCs composed of posttreated photoanodes at 450°C showed an increase inJSCand consequently an increase in efficiency of 10%. Investigations were made to determine the electron recombination via the electrolyte by the OCVD technique. We found that the posttreatment has the effect of reducing the surface trap states and thus increases the electron lifetime, which is responsible for the increase of the overall cell efficiency.

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