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February 12, 2014

BIPV at the 28th EU PVSEC

Andrew Flood's picture

I often find it easy to get lost in my little corner of the solar research world and focus exclusively on my own work. Readings get limited to those directly related to my research. Indeed, as someone who focuses primarily on cell-level technology, it’s easy for me to lose the bigger picture of how such a technology might be used. Hence, one of the advantages of going to a conference is the breadth of material covered, and its accessibility. This allows me to “take a quick peek” at some ideas that I wouldn’t normally consider “directly important to my research”. At the IEEE conference in Florida, I went to many talks regarding new cell concepts (see my blog post on “Photon Up- and Down-Conversion”). In Paris, at EU PVSEC 2013, I spent some time checking stuff on building integrated photovoltaics (BIPV). Different groups seem to have different opinions on what constitutes BIPV. Some people seemed to interpret BIPV to mean any

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December 12, 2013

Photon Up- and Down-Conversion at IEEE PVSC

Andrew Flood's picture

Another day, another interesting idea. The ideas were not from my own brain, of course, but from the minds of others. A recent trip to the IEEE Photovoltaic Specialists Conference (PVSC) in Tampa led to both ingredients mentioned by Einstein in his recipe for genius: inspiration (from conference speakers) and perspiration (from Tampa weather). Although all of us PVINers had some talks to attend on technology related to our specific research, it was often in the talks on “Fundamentals and New Concepts for Future Technologies”, or “Area 1”, that one found new ideas that could potentially be applied to a wide-variety of technology bases. This was so much the case, that “when in doubt, go to Area 1” became a mantra. Such wandering brought me to the talks on “up-conversion” and “down-conversion”. Up-Conversion and Down-Conversion of Photons The conversion of photons of one frequency to those of a different frequency is referred to as either up- or down-conversion. This new

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November 28, 2013

PVSC 2013-Fun Times in Florida!

Kevin's picture

I recently had the opportunity (and pleasure!) of attending the 39th Photovoltaics Specialists Conference (PVSC) in Tampa, Florida. The conference, which is put on by the Institute of Electrical and Electronics Engineers (IEEE), is an annual meeting of scientists and engineers who work in the field of solar energy. PVSC attracts people from all over the world to come and share their research on some of the cutting-edge topics in the field. In this entry I will be providing some highlights of the trip, especially topics that were of interest to me. I once again had the honour of hosting (alongside other HQP) the Photovoltaic Innovation Network (PVIN) booth. As I have mentioned in previous blog entries, the booth is where we get to represent Canada’s research in photovoltaics. A lot of companies and Universities outside of Canada do not know exactly what we do up in Canada in regards to photovoltaic research, so the booth gives us an opportunity

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November 18, 2013

PVSC 2013-Tandem CIGS Solar Cells

A subject that caught my attention during the 39th edition of the Photovoltaic Specialist Conference (PVSC) was a poster from Toshiba Corporation [1] about the study of a homojunction CIGS (Copper Indium Gallium Selenium) solar cell. CIGS solar cells are gaining more and more interest in the photovoltaic community as a thin film solar cell due to the material’s high absorptivity, low cost and relatively high power conversion efficiency.  Standard CIGS solar cell consists of a p-type CIGS base, n-type CdS emitter and a ZnO transparent conductive oxide. This heterojunction between CIGS and CdS results in a conduction band offset. The heterojunction structure is used due to the fact that it is hard to get high enough levels of n-type doping in CIGS. P-type doping in CIGS is usually done intrinsically through Cu vacancies, which act as acceptors. To achieve n-type doping, a donor material would need to be introduced into CIGS.  In their poster, the Toshiba corporation group reported

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October 31, 2013

Spectrum Splitting and Thin Film Photovoltaics at PVSC 2013

Figure 1 of Xianqin's blog

At the 39th Photovoltaic Specialist Conference in Tampa, Florida, there were two important and interesting topics which were of particular interest to me. The first one was covered by Harry A. Atwater, California Institute of Technology (http://daedalus.caltech.edu/research/thinfilmpv.php) “Full Spectrum High Efficiency Photovoltaics” [1]. He was discussing a new concept: splitting the incident solar spectrum into its constituent wavelengths, guiding these different wavelengths into solar cells with different bandgaps, then absorbing them (shown in Figure 1).

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October 22, 2013

Highlights from PVSC 2013

Jingfeng's picture

The IEEE Photovoltaic Specialist Conference (PVSC) is renowned as one of the world’s largest photovoltaics (PV) conferences. It is also probably the oldest conference that is still been held annually. I was fortunate enough to have the opportunity to attend the conference this year, for the second time. As the PV energy market is evolving from niche to mainstream, I’ve noticed some shift of focus in the topics of this year’s conference. The most noticeable would be the emphasis on the long-term reliability of PV systems. The very first plenary session on Monday morning was dedicated to PV reliability issues, with two talks covering both modeling and analysis of data collected from real field operations. While crystalline silicon is still the dominant technology, exploration into new materials and concepts has never been slowed down. It is the same with this year’s conference. It is my area of interest to discover potential new technologies that can bring fundamental improvement to the

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October 15, 2013

PVSC 2013-Discussions on Photovoltaic System Implementation at the 2013 Photovoltaic Specialist Conference

Jafaru Mohammed's picture

The 39th IEEE photovoltaic specialist conference was held between June 16th and 21st at the Tampa bay convention center in Tampa, Florida. It was a congregation of industry experts, and research giants. Researchers from NREL, Sandia National Laboratories and Universities across the globe graced the occasion to present their latest studies on photovoltaic system design, implementation and reliability of on-sun PV modules.. The program was significantly all encompassing. Besides the presentations, social activities and mixer programs were held to allow attendees to interact, network and share knowledge. Of notable interest was the presentation of the cherry award to Keith Emery. Previously unknown to me, I found that he is renowned for his contribution to photovoltaic research for his design, development and implementation of IV characterization methods. He pioneered the first generation of hardware, software and procedures to measure current-vs.-voltage characteristics as a function of temperature, spectrum and intensity for single and multi-junction cells and modules. Oral and poster presentations at the

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October 7, 2013

PVSC 2013-Luminescent Coupling

Matt Wilkins

In June, I had the opportunity to attend the IEEE Photovoltaic Specialists’ Conference in Tampa, FL.  This is a huge academic conference covering the entire field of photovoltaics, and has been at the center of photovoltaic research since 1961. One topic that got a lot of discussion this year was ‘luminescent coupling’, a process where energy that is lost through photons radiated from one part of a solar cell can be recovered by absorption in another part of the same cell [1,2].  This has potential to change the way that solar cells – especially very high-efficiency multi-junction solar cells – are designed, either through careful control  of the internal optics of the cell, or by manipulating materials so that photons are emitted in particular directions where they have a high probability of being recovered.  In this way radiative loss, which is an important loss mechanism in multi-junction cells, can be partially suppressed. There is an added benefit to designing cells

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September 22, 2013

PVSC 2013-CdTe thin films progress

I had the opportunity to go to PVSC 39 in Tampa, Florida with fellow Highly Qualified Personnel (HQP). There were a lot of interesting speeches but I will only focus on a couple of them here – particularly those focusing on CdTe thin films progress. CdTe is one of the most attractive materials for production of low cost thin film solar modules [1]. The record efficiency for CdTe solar cells has been established to be 16.7% for 10 years. In the past 2 years, the CdTe record was broken several times and increased from 16.7% to 18.7%. However, there has been no significant change in the open-circuit voltage which was in the range of 840-860 mV for over 20 years. Many arguments have been made to justify the apparent Voc limitation, most frequently: poor hetero-interface with CdS, the difficulty in doping polycrystalline CdTe, midgap defect levels, or non-uniformities at the nano- or micro-scale. Paths for open-circuit voltage above 900 mV

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September 6, 2013

PVSC 2013 in Tampa, Florida

This year, the Photovoltaics Specialists Conference was held in Tampa.  In the middle of June in Florida, you could really feel the sun.  It was hot.  The temperature accounting for humidity was easily into the 40’s each day.   And this was awesome for me, since I almost feel perpetually cold in Ottawa.  An ultra-hot day feels like a blessing so I didn’t mind it at all. We conveniently stayed right across the street from the Tampa Convention Centre, which was also conveniently connected to our hotel with a bridge.  All it took was a quick 30 seconds in the heat and it was back to the frigidity of an air conditioned building.   The actual conference was much more along the interests of the students in the network.  And you could tell.  Students were picking out their sessions as soon as they got their hands on a physical copy of the conference schedule.  I was amazed by the sheer volume of

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