High Performance InGaAs PIN Photodetector

In this paper, high quality InGaAs PIN photodetector prepared on S-doped InP substrate by metal organic chemical vapor deposition (MOCVD) are investigated. With a absorption layer of 2.8 mum and a photosensitive diameter window of 60 mum at reverse bias of 5V, dark current of 105 pA, capacitance of 0.475 pF, and the optical responsivities of 0.76 AAV and 1.17A/W, and the detectivities (D*) of 3.69><10
¹²
cmHz
⁰⁵
W
^-1
and 5.6x10
¹²
cmHz
⁰⁵
W
^-1
, have been determined at 131 mum and 155 mum, respectively. Moreover, the 3-dB bandwidth of photodetector was estimated to be 6.7 GHz.