DOE Energy Frontier Research Centers awarded

4 07 2014

U.S. Energy Secretary Ernest Moniz today announced the awarding of $100 million for Energy Frontier Research Centers (EFRCs) to accelerate the scientific breakthroughs needed to build the 21st-century energy economy

 

Energy Frontier Research Centers (EFRCs)





Insights about physical mechanisms in perovskite solar cells

23 06 2014

Photoinduced Giant Dielectric Constant in Lead Halide Perovskite Solar Cells

J. Phys. Chem. Lett.Just Accepted
Publication Date (Web): June 23, 2014 (Letter)
DOI: 10.1021/jz5011169

Slow Dynamic Processes in Lead Halide Perovskite Solar Cells. Characteristic Times and Hysteresis

J. Phys. Chem. Lett.Just Accepted
Publication Date (Web): June 18, 2014 (Letter)
DOI: 10.1021/jz5011187




How to draw Figures correctly

19 06 2014

The new issue of JPCLett editorial on Graphical Excellence explains how to draw Figures correctly. It presents important instructions that the authors can follow while preparing graphics for a scientific publication. J. Phys. Chem. Lett., 2014, 5 (12), pp 2118–2120
DOI: 10.1021/jz500997e http://pubs.acs.org/doi/pdfplus/10.1021/jz500997e





Most Highly Cited Researchers

11 06 2014

Thomson Reuters has released a new list of highly cited. You can find it at

http://highlycited.com/index.htm#table

I happen to be in the list





Progress in quantum dot sensitized solar cells

2 06 2014

Quantum dot sensitized solar cells use small inorganic quantum dot absorbers, or ultrathin absorber layers, on a nanostructured TiO2 electron collector framework, and the hole extraction from the absorber is realized by a liquid electrolyte or solid hole conducting material. Some years ago, efficiencies and stabilities of this type of solar cell were really negligible. But recently, a steady raise of the results shows that these solar cells should be taken very seriously. The QDSSC have the credit that the perovskite solar cells started in this version, in the work of Miyasaka and coworkers in 2009. But apart from the great consequences of that discovery, QDSSC show other developments that are very interesting on their own.

In 2013 Xinhua Zhong and coworkers presented in JACS a CdTe/CdSe QD-based solar cell exhibiting a record PCE of 6.76%. The key advancement of this result was the core-shell structure of the QD provoking a charge transfer or excitonic absorption that extends light harvesting up to 900 nm. A new result published this week by the same group uses CIS (CuInS2), a famous photovoltaic material, to make QDs for sensitization. Using a core-shell CIS-ZnS structure, adequate passivation reduces recombination and leads to the development of high efficiency “green” solar cell of 7.04% efficiency  (with certified efficiency of 6.66%), which greatly surpasses the previous best “green” QDSSC of 2.5% efficiency. This achievement shows that of Cd and Pb free QDs can provide similar or better results than their more toxic and widely used counterparts.

Another material showing great progress is the QDs of Sb2S3. Pioneered by Gerardo Larramona in IMRA, France, Sb2S3 Qds have been used for some years to build all solid QDSSC. Typical results of Pablo Boix, Larramona and coworkers in 2012 was 3.20% efficiency. This was increased to 5.7% by Seigo Ito in 2013, and now a series of result by the group of Sang Il Seok shows impressive power conversion efficiencies exceeding 7%. Again the key to these results is the use of graded or core shell QD structures, enhancing the light absoroption range of the QDs, as well as effective passivation treatments that reduce recombination.

 

The next great opportunity to monitor the developments of this field is the nanoGe conference on Solution Processed Semiconductor Solar Cells, from 10 to 12 September 2014, in Oxford, organized by Henry Snaith.

Xinhua-picture

Xinhua Zhong

Tarak Nath Mandal, Sang il Seok and Yong Chan Choi

Tarak Nath Mandal, Sang il Seok and Yong Chan Choi

 

Jin Wang, Iván Mora-Seró, Zhenxiao Pan, Ke Zhao, Hua Zhang, Yaoyu Feng, Guang Yang, Xinhua Zhong, and Juan Bisquert, Core/Shell Colloidal Quantum Dot Exciplex States for the Development of Highly Efficient Quantum-Dot-Sensitized Solar Cells, J. Am. Chem. Soc., 2013135, pp 15913–15922

http://pubs.acs.org/doi/abs/10.1021/ja4079804

 

Zhenxiao Pan, Ivan Mora-Sero, Qing Shen, Hua Zhang, Yan Li, Ke Zhao, Jin Wang, Xinhua Zhong, and Juan Bisquert, High Efficiency “Green” Quantum Dot Solar Cells, Journal of the American Chemical Society, 2014, DOI: 10.1021/ja504310w

http://pubs.acs.org/doi/abs/10.1021/ja504310w

 

P.P. Boix, G. Larramona, A. Jacob, B. Delatouche, I. Mora-Seró, J. Bisquert: Hole transport and recombination in all-solid Sb2S3-sensitized TiO2 solar cells using CuSCN as hole transporter J Phys Chem C, 116 (2012), pp. 1579–1587

http://pubs.acs.org/doi/abs/10.1021/jp210002c

 

Seigo Ito, Kazuki Tsujimoto, Duy-Cuong Nguyen, Kyohei Manabe, Hitoshi Nishino, Doping effects in Sb2S3 absorber for full-inorganic printed solar cells with 5.7% conversion efficiency, International Journal of Hydrogen Energy, Volume 38, Issue 36, 2013, Pages 16749-16754,

http://dx.doi.org/10.1016/j.ijhydene.2013.02.069

Efficient Inorganic-Organic Heterojunction Solar Cells Employing Sb2(Sx/Se1-x)3 Graded-Composition Sensitizers, Yong Chan Choi , Yong Hui Lee , Sang Hyuk Im , Jun Hong Noh , Tarak Nath Mandal , Woon Seok Yang , and Sang Il Seok, Advanced Energy Materials, 2014, DOI: 10.1002/aenm.201301680

http://onlinelibrary.wiley.com/doi/10.1002/aenm.201301680/abstract

 

Highly Improved Sb2S3 Sensitized-Inorganic–Organic Heterojunction Solar Cells and Quantification of Traps by Deep-Level Transient Spectroscopy. Yong Chan Choi , Dong Uk Lee , Jun Hong Noh , Eun Kyu Kim , and Sang Il Seok, Advanced Functional Materials, 2014, DOI: 10.1002/adfm.201304238

http://onlinelibrary.wiley.com/doi/10.1002/adfm.201304238/abstract

 





My book

1 06 2014

After 4 years in the writing, it is coming…

Nanostructured Energy Devices : Equilibrium Concepts and Kinetics 
by Juan Bisquert 

Overview – This book covers the physical principles and applications of a range of nanoscale materials and devices that are key for the energy revolution, including hybrid and organic solar cells, lithium batteries, and supercapacitors. Topics discussed range from the fundamental concepts of operating nanoscale energy devices to advanced device modeling. Modeling is presented as a function of the characterization techniques used to test device properties, emphasizing impedance spectroscopy characteristics, since it provides a unifying theme that connects the properties of the different energy devices.
  • ISBN-13: 9781439836026
  • ISBN-10: 1439836027
  • Publisher: CRC Press
  • Publish Date: October 2014
  • Page Count: 384




Thank you readers

29 05 2014

This blog hit yesterday 100,000 visits. I want to thank all the people that visit the blog and I also want to say that I am honored by the large number of followers. People I meet in travels often tell me they enjoy to follow here the news about the progress of new photovoltaic technologies. I will try my best to continue to blog interesting information.








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