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Gogolin R.,Institute for Solar Energy Research Hamelin | Turcu M.,Institute for Solar Energy Research Hamelin | Ferre R.,Institute for Solar Energy Research Hamelin | Ferre R.,MANZ AG | And 8 more authors.
IEEE Journal of Photovoltaics | Year: 2014

We present an experimental method to quantify the series resistance R a-Si/ITO through the a-Si:H layers and the a-Si:H/ITO interface on test structures. In order to optimize Ra-Si/ITO, we apply different a-Si:H and ITO deposition parameters. We find the best value for R (p)-a-Si/ITO of 0.42 Ω·cm2 for an ITO double layer with a 10-nm-thin starting layer that provides good contact resistance and an additional 90-nm top layer that provides good conductivity. For R (n)-a-Si/ITO , we reach values below 0.1 Ω·cm 2. We present an analysis of the series resistance and shading losses of our 100-cm2 bifacial screen-printed a-Si:H/c-Si heterojunction solar cells, which show an open-circuit voltage of Voc = 733 mV, demonstrating the excellent level of interface passivation. The efficiency of 20.2% is limited by a low short-circuit current density of 37.1 mA/cm 2 and fill factor of 76%. © 2014 IEEE. Source


Smith D.D.,Sun Power Corporation | Cousins P.,Sun Power Corporation | Westerberg S.,Sun Power Corporation | Jesus-Tabajonda R.D.,Sun Power Corporation | And 2 more authors.
IEEE Journal of Photovoltaics | Year: 2014

This paper reports recent efficiency results achieved by SunPower (SPWR) using industrially relevant manufacturing processes and then reexamines the following age-old question: 'What efficiency can a single-junction Silicon solar cell suited to large-scale manufacturing achieve?' Through examination of a gap analysis of the SPWR cell and use of other relevant proof-points, insights are provided into the remaining challenges to achieving the practical limits. © 2014 IEEE. Source


Bunea M.M.,Sun Power Corporation | Johnston K.W.,Sun Power Corporation | Bonner C.M.,Sun Power Corporation | Cousins P.,Sun Power Corporation | And 4 more authors.
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2010

Herein, the performance of low-cost crystalline silicon solar cells under low to medium levels of concentration is explored. Simulations and experimental results are shown for concentrations up to 20 suns. An efficiency of 23% at 9 suns is achieved on a 34.5 mm × 125 mm solar cell using Sun Power's standard production process. Low sensitivity of cell performance to illumination profile and position is also demonstrated. © 2010 IEEE. Source

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