NOVELTY - A glass substrate (1) for use in an electronic device, comprises first and second major surfaces, with at least part of the first major surface is patterned and located at a light-incident side of the substrate. At least a central portion of the first major surface is patterned to form several peaks and valleys in a patterned portion. An edge portion (8) of the first major surface, immediately adjacent an absolute edge (12) of the glass substrate, is flat and is located immediately adjacent the peaks and/or valleys. The flat edge portion is partially covered by a frame.    USE - As a glass substrate for use in a electronic device such as photovoltaic device (claimed) e.g. solar cell for converting solar radiation and other light into electrical energy.    ADVANTAGE - The glass is a low-iron type glass to provide a combination of high visible transmission, high infrared transmission and/or high solar transmission, thereby leading to increased solar efficiency of the photovolatic devices. The edge portion can be ground down so that seal can be more securely and/or efficiently attached to the device to partially encapsulate part of the electronic device. The glass structure is capable of allowing much solar radiation to pass through the glass substrate; and seals/casings could efficiently and securely be attached to the electronic device in order to adequately protect the structure from mechanical damage and/or environmental conditions. The patterns are effective at capturing so called off-axis light.    DETAILED DESCRIPTION - A glass substrate (1) for use in an electronic device, comprises first and second major surfaces, with at least part of the first major surface is patterned and located at a light-incident side of the substrate so that light incident on the device hits the first major surface before hitting the second major surface. At least a central portion of the first major surface is patterned to define several peaks and valleys in a patterned portion. An edge portion (8) of the first major surface, immediately adjacent an absolute edge (12) of the glass substrate, is flat and is located immediately adjacent the peaks and/or valleys of the patterned portion on the same first major surface. The flat edge portion of the glass substrate is adapted to be at least partially covered by a frame such that the frame does not cover any significant part of the patterned portion of the first major surface of the glass substrate. The flat edge portion extends inwardly from the absolute edge of the glass substrate from 0.1-2.5 cm, and extends around an entire periphery of the first major surface. The first major surface has a surface roughness (between peaks/valleys) of 0.1-5 mu m. INDEPENDENT CLAIMS are included for the following:    (1) making a photovoltaic device, involving providing the glass substrate; grinding down an edge portion of the first major surface of the glass substrate, using at least one grinding wheel, to grind the patterned portion flat at the edge portion but not in a central portion of the first major surface of the glass substrate, where grinding the edge portion is flat; forming the photovoltaic device so that the glass substrate is located at a light-incident side of the photovoltaic device, and the second major surface of the glass substrate is closer to an absorber of the photovoltaic device than is the first major surface which includes both the patterned portion; and attaching a frame to the photovoltaic device; and    (2) a photovoltaic device comprising the glass substrate, a front electrode, a semiconductor photoelectric film, and a frame (9) encapsulating at least part of an edge of the photovoltaic device to protect at least part of the edge of the photovoltaic device from damage.    DESCRIPTION OF DRAWING(S) - The figure shows a cross sectional view of a part of the photovoltaic device.    Glass substrate (1)    Photovoltaic device (6)    Ground-flat portion (8)    Frame (9)    Absolute edge of photovoltaic device. (12)