title: Two-dimensional photo-mapping on CMOS single-photon avalanche diodes.
abstract: Two-dimensional (2-D) photo-count mapping on CMOS single photon avalanche diodes (SPADs) has been demonstrated. Together with the varied incident wavelengths, the depth-dependent electric field distribution in active region has been investigated on two SPADs with different structures. Clear but different non-uniformity of photo-response have been observed for the two studied devices. With the help of simulation tool, the non-uniform photo-counts arising from the electric field non-uniformity have been well explained. As the quasi-3D distribution of electric field in the active region can be mapped, our method is useful for engineering the device structure to improve the photo-response of SPADs.
authors: Jau-Yang
authors: JY
authors: Wu
authors: Ping-Keng
authors: PK
authors: Lu
authors: Sheng-Di
authors: SD
authors: Lin