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Further reading is available here:
Paper describing the SPAD device: J. A. Richardson, L. A. Grant and R. K. Henderson; “Low
Dark Count Single-Photon Avalanche Diode Structure Compatible With Standard
Nanometer Scale CMOS Technology”, Photonics Technology Letters, IEEE, Jul. 2009, vol. 21,
no. 14, pp. 1020-1022.
Paper describing the PF32 device: J. Richardson, R. Walker, L. Grant, D. Stoppa, F. Borghetti,
E. Charbon, M. Gersbach and R. K. Henderson; “A 32×32 50ps resolution 10 bit time to digital
converter array in 130nm CMOS for time correlated imaging”, IEEE Custom Integrated
Circuits Conference (CICC), San Jose, USA, September 2009, pp. 77-80.