A simple, inexpensive and highly efficient fuel cell has boundary structures made of a photo-sensitive material in combination with selective patterning. The analyte ions are produced in an ion source operating at near atmospheric pressure and transferred via a dielectric capillary into the vacuum system of the mass analyzer. The bonding material layer includes gaps between the silicon layer and the glass layer at areas where no bonding material is present. The second conductive layer may line the channel extending around a portion of the conductor end.