A wireless communication device includes a housing, an antenna, and a transceiver for transmitting and receiving wireless signals through the antenna. The graded materials distribution varies between the surface and the bottom of the absorber layer such that a molar ratio of is the highest at the bottom of the absorber layer and the lowest at the surface of the absorber. The contact metallization is formed of pure metal layers compatible with each other and with the underlying semiconductor cap layer such that depth of reaction is minimized and controllable by the thickness of the metal layers applied. The inorganic bismuth compounds are at least one inorganic bismuth selected from among bismuth sulfate, bismuth trioxide, bismuth carbonate, and sodium bismuthate. The ion transmission device can have a number of effects, including: substantially spreading out the generated ions along an ion axis to generate a quasi-continuous beam; reducing the energy spread of ions emitted from the source; and at least partially suppressing unwanted fragmentation of analyte ions.