Page 15 - JCERDC Status Report

titania. For Si nanowire solar cells, the use of level performance. On perovskite modeling, SERIIUS
Titanium dioxide (TiO ) as a carrier selective it has been shown that it is indeed possible
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contact is being explored. to design devices which show valid
• As reported earlier, solar cells have been superposition between the dark and the
fabricated with 15.9% efficiency on 6” wafers light IV, thus leading to better fill factor (FF).
received from Sun Edison and process of Simulations show the path to realizing ~ 27%
recovery of silicon from kerf dust is being efficiency perovskite solar cells.
optimized. During the last 6 months work on • Field data obtained from installations
recovery of kerf dust has been progressing. in different climatic zones in India and
Amorphous Si (480 cm-1) was detected in USA continues to be taken and analysed
Raman after wafering. Residual stress exists alongside solar PV development for rural
in Si swarf after cutting process. Stress and commercial applications. During the
distribution is narrow in the beginning of last 6 months, degradation analysis of PV
the cutting process whereas the variability power plants in a hot-dry climate (Phoenix,
increases at the end of the cutting process. AZ) using the metered kWh data supplied by
• As reported earlier, a series of coordinated the utility companies has been performed,
measurements and simulations have been and compared with rates obtained by three
made on Heterojunction with Intrinsic other methods. Also, risk priority number
Thin-layer (HIT) solar cells obtained from analysis of failure has been undertaken. IIT
Moser Baer. During the last 6 months, Madras and ASU are jointly working on the
particular emphasis has been put on reliability evaluation of UDPM developed by
Deep-level transient spectroscopy (DLTS) IIT Madras.
measurements. • Work on improved encapsulants with
• Corning’s flexible Willow® glass continues improved water vapor transmission rate
to be shipped. It has been used to fabricate (WVTR). Al doped ZnO films developed for
CZTS and CIGS solar cells. During the last 6 TCO applications; Work on dust mitigation.
months, OPV on Willow glass has also been During last 6 months, Nanocomposite films
made, and study on flexural stress in these with MgO developed at LBNL showing
devices undertaken. very good WVTR are being tested at IISc.
p-type Cu:ZnS developed at IITB and LBNL
• Modeling work on PV from materials to show sheet resistance <2500 ohm/> and
devices to modules is under way, including transparency> 85% at 500 nm. Films show
band structure calculations; modeling stable performance over a period of 3 months.
and simulation of HIT cells from Moser Artificial soiling apparatus and performance
Baer; modeling improvement in efficiency loss evaluation has been developed while
for perovskite solar cells. During the last the analysis of dust from different locations
6 months, a model for process-to-panel in India is under way.
level performance estimation of HIT cells
has been taken up for development. The MULTISCALE CONCENTRATED SOLAR
a-Si process model developed at MIT has POWER
been coupled with the device simulations • Optimization of ORC and Supercritical CO -
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at Purdue to estimate the effect of a-Si based cycles based on thermodynamic analysis;
deposition conditions on eventual panel Completed technical design of a research

Status Report 2015 15