Ajeet Rohatgi

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The traditional approach in electric power generation is to have centralized plants distributing electricity through an extensive transmission & distribution network. Distributed generation (DG) provides electric power at a site closer to the customer, eliminating the unnecessary transmission and distribution costs. In addition, it can reduce fossil fuel(More)
ACKNOWLEDGEMENTS I would like to express my gratitude to all those who gave me the opportunity to complete this thesis. I wish to express my deepest thanks to my advisor, Dr. John D. Cressler. Thank you for educating me, for supporting my PhD work, and most importantly, for showing me the essence of life as a scientific researcher, a husband, and a father.(More)
  • T H Wang, E Iwaniczko, M R Page, D H Levi, Y Yan, V Yelundur +3 others
  • 2005
Thin hydrogenated amorphous silicon (a-Si:H) layers deposited by hot-wire chemical vapor deposition (HWCVD) are investigated for use in silicon heterojunction (SHJ) solar cells on p-type crystalline silicon wafers. A requirement for excellent emitter quality is minimization of interface recombination. Best results necessitate immediate a-Si:H deposition and(More)
  • D S Kim, A M Gabor, V Yelundur, A D Upadhyaya, V Meemongkolkiat, A Rohatgi
  • 2003
We have fabricated 4 cm 2 cells on String Ribbon Si wafers with efficiencies of 17.8% using a combination of laboratory and industrial processes. These are the most efficient String Ribbon devices made to date, demonstrating the high quality of the processed silicon and the future potential for industrial String Ribbon cells. Co-firing PECVD (Plasma(More)
  • D L Meier, Ii P Davis, A Shibata, T Abc, K Kinoshita, C Bishop +4 others
  • 2005
Contacts to <III> Si which are self-doping and selt~aligning were investigated. Such contacts are applicable both to conventional cell structun:s as selective emitters and to more demanding structures such as interdigitated back contact cells. Emphasis was placed on alloyed contacts of AI for providing a self-doping p-type contact and of Ag-Sb for a(More)
Traditional Czochralski grown Si solar cells are known to suffer from light induced degradation (LID) which adversely affects the minority carrier lifetime. Multi-crystalline Si has also been shown to show a similar degradation/recovery cycle after a phosphorus gettering step. In this paper, promising ribbon and cast multi-crystalline Si are examined for(More)
  • D S Kim, V Meemongkolkiat, A Ebong, B Rounsaville, V Upadhyaya, A Das +1 other
  • 2006
Two-dimensional numerical simulations were performed to derive design rules for low-cost, high-efficiency interdigitated back contact (IBC) solar cells on a low-cost substrate. The IBC solar cells were designed to be fabricated using either the conventional screen printing or photolithography metallization processes. Bulk lifetime, bulk resistivity, contact(More)
Placement of protection devices in a conventional feeder (without distributed generation) is often performed so as to minimize traditional reliability indices (SAIDI, SAIFI, MAIFIe…), assuming the sole source(s) of energy at substation(s). Distributed generation (DG) and storage units located on the feeder may be constrained in terms of power and/or energy(More)