Search

Your search keyword '"Chang-Yong Nam"' showing total 4 results
Start Over Author "Chang-Yong Nam" Journal journal of the american chemical society
4 results on '"Chang-Yong Nam"'

1. Phthalocyanine blends improve bulk heterojunction solar cells

Author

Varotto, Alessandro, Chang-Yong Nam, Radivojevic, Ivana, Tome, Joao P.C., Cavaleiro, Jose A.S., Black, Charles T., and Brain, Charles Michael

Subjects
Chromophores -- Structure, Chromophores -- Chemical properties, Phthalocyanins -- Structure, Phthalocyanins -- Chemical properties, Solar batteries -- Chemical properties, Solar batteries -- Structure, Solar cells -- Chemical properties, Solar cells -- Structure, Chemistry
Abstract

A core phthalocyanine platform has allowed engineering of the solubility properties of the band gap, shifting the maximum absorption toward the end. A simple method is described for increasing the efficiency of heterojunction solar cells by using a self-organized blend of phthalocyanine chromophores prepared by solution processing.

Published
2010

2. Efficient organic solar cells with helical perylene diimide electron acceptors

Author

Matthew Y. Sfeir, Qizhi Xu, Rongsheng Chen, M. Tuan Trinh, Yueh-Lin Loo, Chang-Yong Nam, Wei Wang, Shengxiong Xiao, Michael L. Steigerwald, Charles T. Black, Xiaoyang Zhu, Fay Ng, Petr P. Khlyabich, Colin Nuckolls, Bharat Kumar, and Yu Zhong

Subjects
chemistry.chemical_classification, Organic solar cell, Chemistry, Exciton, Electron donor, General Chemistry, Electron acceptor, Photochemistry, Biochemistry, Acceptor, Catalysis, Condensed Matter::Materials Science, chemistry.chemical_compound, Colloid and Surface Chemistry, Diimide, Ultrafast laser spectroscopy, Physics::Atomic and Molecular Clusters, Physics::Chemical Physics, Perylene
Abstract

We report an efficiency of 6.1% for a solution-processed non-fullerene solar cell using a helical perylene diimide (PDI) dimer as the electron acceptor. Femtosecond transient absorption spectroscopy revealed both electron and hole transfer processes at the donor–acceptor interfaces, indicating that charge carriers are created from photogenerated excitons in both the electron donor and acceptor phases. Light-intensity-dependent current–voltage measurements suggested different recombination rates under short-circuit and open-circuit conditions.

Published
2014

3. Phthalocyanine Blends Improve Bulk Heterojunction Solar Cells

Author

Charles Michael Drain, Ivana Radivojevic, João P. C. Tomé, José A. S. Cavaleiro, Alessandro Varotto, Chang-Yong Nam, and Charles T. Black

Subjects
Indoles, Organic solar cell, Band gap, Isoindoles, Photochemistry, Biochemistry, Article, Catalysis, Polymer solar cell, chemistry.chemical_compound, Electric Power Supplies, Colloid and Surface Chemistry, Solar Energy, Absorption (electromagnetic radiation), business.industry, Chemistry, Heterojunction, General Chemistry, Hybrid solar cell, Solar energy, Solutions, Solubility, Spectrophotometry, Phthalocyanine, Optoelectronics, business
Abstract

A core phthalocyanine platform allows engineering of the solubility properties the band gap, shifting the maximum absorption toward the red. A simple method for increasing the efficiency of heterojunction solar cells uses a self-organized blend of phthalocyanine chromophores fabricated by solution processing.

Published
2010
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results