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Caption : fig. s1 : linear plot of i-v charactristics of pds s0,….., s5 under the illumination of light of different wavelength.

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Caption : fig. s2 : semi-log plot of i-v charactristics of pds s0,….., s5 under the illumination of light of different wavelength.

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Caption : fig. s3: (a) sensitivity (s), (b) eqe, (c) detectivity (d) and (d) responsivity (r) of pds s0,……..,s5 under the illumination of light at 405 nm, 532 nm, 635 nm, 650 nm and 782 nm.

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Caption :  fig. s4: sensitivity (s), eqe, detectivity (d) and responsivity (r) of pds (a) s0, (b) s1, (c) s2, (d) s3, (e) s4 and (f) s5 as a function of +ve biasing voltage under the illumination of light of wavelength of 782nm.

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Caption : fig. s5: i-t characteristics of pds s0,…….,s5 at an external bias of 3v under the illumination of light of 782 nm.

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Caption : fig. s6: i-t characteristics of pds s0,…….,s5 at an external bias of 5v under the illumination of light of 782 nm.