APDS
雪崩光电二极管
响应度
光电子学
材料科学
击穿电压
雪崩击穿
暗电流
撞击电离
光电探测器
电压
光学
物理
电离
探测器
离子
量子力学
作者
W. Wang,Jinshan Yao,Linze Li,Huachen Ge,Luyu Wang,Liqi Zhu,Qiushi Chen,Hong Lü,Baile Chen
摘要
Digital alloy (DA) InAlAs on the InP substrate exhibits a lower excess noise compared to a traditional In0.52Al0.48As random alloy as the multiplication layer in avalanche photodiodes (APDs). This work implements DA InAlAs as the multiplication layer in a 1550 nm separate absorption, grading, charge, and multiplication APD and characterizes the performances through various analyses. The device reaches a maximum gain of 221 before avalanche breakdown, with a maximum gain-bandwidth product of more than 140 GHz. At 90% breakdown voltage, the dark current density is 4.1 mA/cm2, and the responsivity is 0.48 A/W at unit gain. Excess noise factors were identified, yielding an effective k value of around 0.15, which is lower than that of random alloy In0.52Al0.48As APDs (k ∼0.2). These findings show that DA InAlAs has the potential to be a promising material for high-performance APDs.
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