Modeling Photocurrent Spectra of High-Indium-Content InN/InGaN Disk-in-Wire Photodiodes

This work reports comprehensive modeling of photocurrent spectra generated by an In0 $\boldsymbol{{ }_{.91} \text{Ga}_{0.09} \mathrm{N} /\text{In}_{0.4} \text{Ga}_{0.6} \mathrm{N}}$ disk-in-wire photodiode based on the effective bond-orbital model. The photocurrent spectra contributed by both single-photon absorption and two-photon absorption are calculated. The physical mechanisms for the observed prominent peaks are identified and investigated.