In this paper, the practical viability of an organic bulk heterojunction (BHJ)-based photodiode is studied, including the analysis of dark current density ( $Jd$ in $hboxA/cm2$), external quantum efficiency (EQE in percent), responsivity (R in A/W), noise-equivalent power (in $hboxW/Hz1/2$), and specific detectivity (Jones in $hboxcmHz1/2/hboxW$). The dark current was minimized down to 90 $hboxpA/cm2$ in $rmP3rmHT:rmPC60hboxBM$ BHJ photodiodes by increasing the thickness, whereas the EQE maintained high values. The measured noise current was $2.20times10-13$, $1.13times10-13$, and $1.94times10-14hboxA/Hz1/2$ for 45-, 55-, and 65-nm BHJ photodiodes, respectively. With those values, the calculated detectivity obtained, given light of a 550 nm wavelength, was $2.55times1011$, $5.93times1011$, and $4.16times1012$ Jones, respectively. The results demonstrated a performance of polymer:fullerence photodiode near equivalent to that of Si-based photodiodes.