Current large-scale production of flexible solar devices delivers cells with lowefficiency. In this paper we present an alternative path to organic or inorganicthin films. Our cells combine the remarkable surface passivation properties ofthe silicon heterojunction solar cells design, and the quality of n-type Czwafers. The cells were manufactured on 50-70 µm-thick wafers. The cellshave and efficiency of 17.8-19.2%, open-circuit voltages of 735-742 mV,short-circuit currents of 34.5-35.5 mA/cm2, and fill-factors of72-75%. The cells are not as flexible as bare wafers. Thin cells are particularsensitive to the additional stress introduced by the busbars and the solderedribbons. For radiuses of curvature over 8cm the cells efficiency remains thesame, for radius equal to 6cm the cell efficiency drops less than 2%, and forradius equal to 4cm the drop is less than 3%. The broken fingers due to smallerbend radius lead to higher series resistance and subsequently lowerfield-factors.

Carbon nanotubes (CNTs) are being looked at as a promising material for the submicron or nanometre scale electronic and electro-mechanical devices. At this size, the thermal transport properties of the components become extremely important with regard to the proper functioning of the device. As it is difficult to accurately measure these properties in case of nano devices, predictions using modeling and simulation play an important role in the design of these devices. In this paper, we have estimated and analyzed the thermal conductance of one single-walled carbon nanotube (SWNT) depending upon its geometrical features. We have further extended the simulation to predict the thermal conductance of multi-walled carbon nanotubes (MWNTs). It was found that the SWNT depicts high thermal conductance which depends largely on its geometry and chirality and an MWNT shows very high conductance varying with tube diameter, length and number of shells.