As the solar energy warms the chip, so thermionic emission of electrons also contributes to the power generated, adding to the efficiency of the device.
Definition of low-bandwidth. low-bandwidth. adjective. a session of communication that has little information relative to its time-length. All of his e-mails are so low-bandwidth that I've stopped reading them. See more words with the same meaning: computer slang. Last edited on Nov 11 2011. Submitted by WalterGR (via TheJargonFile) on Aug 14 2009.
There are at least two reasons. Mainly, there just aren't that many low frequencies. As in, there's a MHz of bandwidth from 1 MHz to 2 MHz, but there's 1000 MHz between 1 GHz and 2 GHz. This matters because a single frequency doesn't convey information. To encode information you need to use a range of frequencies. To encode voice at telephone quality requires about 3-5 kHz of bandwidth.