Before revision: Silicon photomultipliers, often called "SiPM" in the literature, are solid-state single-photon-sensitive devices based on Single-photon avalanche diodes ( SPAD ) implemented on common silicon substrate.
After revision: In solid-state single-photon-sensitive devices based on single-photon avalanche diodes ( SPADselectronics, silicon photomultipliers (SiPMs) are ) implemented on common silicon substrate.