As emerging thin-film PV technologies continue to penetrate the market and the number of utility scale installations
substantially increase, detailed understanding of the performance of the various PV technologies becomes more
important. An accurate database for each technology is essential for precise project planning, energy yield prediction and
project financing. However recent publications showed that it is very difficult to get accurate and reliable performance
data of theses technologies.
This paper evaluates previously reported claims the amorphous silicon based PV modules have a higher annual energy
yield compared to crystalline silicon modules relative to their rated performance. In order to acquire a detailed
understanding of this effect, outdoor module tests were performed at GE Global Research Center in Munich. In this
study we examine closely two of the five reported factors that contribute to enhanced energy yield of amorphous silicon
modules. We find evidence to support each of these factors and evaluate their relative significance. We discuss aspects
for improvement in how PV modules are sold and identify areas for further study further study.
KEYWORDS: Solar cells, Silicon, Amorphous silicon, Temperature metrology, Thin films, Solar energy, Solar concentrators, Copper indium disulfide, Photovoltaics, Diffusers
Usually photovoltaic modules are characterized under standard testing conditions by subjecting
them to an irradiation of 1000 W/m2 with an AM 1.5 spectrum and a cell temperature of 25°C.
However, not all modules perform the same under real conditions since their efficiency is
strongly affected by environmental fluctuations. To get real operation data, expensive outdoor
test are performed. However, for most of the new thin film technologies, these data are not
available yet.
The experiments were conducted in an indoor solar simulator, which fulfills the requirements
of irradiation level and solar spectrum within a homogeneous area of 2 by 2.5 meters. In this
contribution we compare different PV modules, including first generation, thin films and
emerging technologies, in order to understand their behavior under various conditions. The
modules were tested as a function of incident angle and diffused versus direct irradiation.
Another aspect that is also taken under consideration is the influence of temperature on the
module performance. These measurements are necessary in order to make a correct assessment
of energy yield in several geographical locations for residential, commercial and utility
applications.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.