| 초록 |
A fine and facile engineering method of organic photodiode (OPD) response spectra via chemical doping, while maintaining their thin-film nature to realize color-filter-free noise-tolerant sensors, is demonstrated. It is shown that excitons with the desired wavelength range can be selectively dissociated by doping-induced engineering of the depletion region width (DW). This method is different from previous optical manipulation methods such as charge collection narrowing, in that DW, not the overall thickness, is controlled. Based on carefully designed planar heterojunction structure, thin-film (~ 500 nm) narrowband (FWHM ＜ 60 nm) R/NIR-selective OPDs are realized with high specific detectivity over 1012 Jones. Furthermore, two OPD applications were carried out: 1) OPD-based optical communication platform with ambient noise-tolerance and 2) ambient light pulse oximetry with two NIR-selective OPDs. |
