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.

Perovskite solar cell record efficiency 17.9%

29 05 2014

A new record efficiency of the perovskite solar cell has been published in the 2014 NREL chart, at 17.9% power conversion efficiency. This solar cell was made by researchers at KRICT Institute in Daejeon, South Korea, that appear in the picture below.

Seok’s group has been producing outstanding results on this field. Yesterday they published a paper in EES in which they present a 1.4 V solar cell. High voltage perovskite solar cells were demonstrated before by Gary Hodes, but the Korean group shows 6.7% efficiency, which makes this cell a rather competitive candidate for large voltage applications. Note that a single cell is close to the voltage of a standard AAA battery…

It is also important to point out that this paper shows that the photovoltage in perovskite solar cells is determined by the separation of Fermi levels in the absorber, as in most solar cells, and not by the difference of workfunction of the contacts. Those who wish to understand, understand.

S. Ryu, J. H. Noh, N. J. Jeon, Y. C. Kim, W. S. Yang, J. W. Seo and S. I. Seok, Energy Environ. Sci., 2014, DOI:10.1039/C4EE00762J.


KRICT researchers Nam Joong Jeon, Sang Il Seok and Jun Hong Noh, authors of the 17.9% perovskite record solar cell

KRICT researchers Nam Joong Jeon, Sang Il Seok and Jun Hong Noh, authors of the 17.9% perovskite record solar cell

Book: Materials Concepts for Solar Cells

22 05 2014

New book by my friend Thomas Dittrich



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Materials Concepts for Solar Cells

by Thomas Dittrich (Helmholtz Center Berlin for Materials and Energy, Germany)
US$58 / £38 / S$73
US$43.50 / £28.50 / S$54.75
US$98 / £65 / S$123
US$73.50 / £48.75 / S$92.25

till 31 May 2014
Discount code:

This textbook bridges the gap between basic literature on the physics of solar cells and highly specialized books about photovoltaic solar energy conversion. It is intended to give students with a background in engineering, materials science, chemistry or physics a comprehensive introduction to materials concepts for solar cells. To this end, general principles of solar cells and materials demands are explained in the first part of this book. The second part is devoted to the four classes of materials concepts for solar cells: solar cells based on crystals of silicon, epitaxial layer systems of III-V semiconductors, thin-film absorbers on foreign substrates, and nano-composite absorbers. » more

HOPV14 pictures

15 05 2014



M. Gratzel, M. K. Nazeeruddin, organizers

M. Gratzel, M. K. Nazeeruddin, organizers

Invited speakers, editors, and organizers

Invited speakers, editors, and organizers


Laura Agut, manager of nanoGe

Laura Agut, director of nanoGe





Next year… Peruggia, Italy


External luminescence and solar cell efficiency

15 05 2014

Eli Yablonovitch and coworkers have shown in an important paper that high external luminescence accompanies high solar cell efficiency, as it indicates low optical losses in the device.

E. Yablonovitch, O. Miller, and S. Kurtz, “Strong Internal and External Luminescence as Solar Cells Approach the Shockley–Queisser Limit,” IEEE Journal of Photovoltaics, vol. 2, no. 3, pp. 303-311, July 2012


Here is prof. Yablonovitch explaining the issue at HOPV14 in Lausanne





HOPV14 program and book of abstracts

8 05 2014