“…The optical receiver (Rx) is an indispensable part of optical interconnects, a high-speed, high-sensitivity Rx can improve the performance of the whole link and reduce the requirements of other active and passive key components. Many works have been done to realize a high-performance photodiodes (PDs) on Si [1] , including germanium (Ge) p-i-n PDs [2,3] , Ge traveling-wave PDs [4,5] , heterogeneously integrated III-V p-i-n and uni-traveling carrier (UTC) PDs [6,7] , heteroepitaxy III-V p-i-n and UTC PDs [8,9] , metal-semiconductor-metal (MSM) PDs [10,11] , and two-dimensional materi-als PDs [12,13] . Compared to conventional PDs, avalanche photodiode (APD) exhibits a higher sensitivity due to its internal gain.…”