Cu‐doped (as p‐doped) and Se‐doped (as n‐doped) Sb 2 S 3 were synthesized from undoped Sb 2 S 3 using a newly developed technique, simple colloidal synthesis method. X‐ray diffraction measurements detected no peaks related to any of the Cu and Se compounds in Cu and Se‐doped samples. Energy dispersive X‐ray analysis, however, confirmed the presence of Cu and Se ions in the doped samples. Diffuse reflectance spectroscopy revealed the optical band gap energy changes because of doping effect, as reported for both the p‐type and the n‐type material. The valence‐band X‐ray photoelectron spectroscopy data showed a significant shift in the valence band to higher (Se‐doped; +0.53 eV) and a shift to lower (Cu‐doped; −0.41 eV) binding energy, respectively, when compared with the undoped sample. We report here on an inexpensive solar cell designed and made entirely of a synthesized material (indium tin oxide/p‐doped Sb 2 S 3  + polyaniline (PANI)/amorphous/undoped Sb 2 S 3  + PANI/n‐doped Sb 2 S 3  + PANI/PANI/electrolyte (0.5 M KI + 0.05 M I 2 )/Al). The cell has a high efficiency of 8% to 9% at a very low light intensity of only 5% sun, which makes it particularly suitable for indoor applications. As found, the cell performance at the intensity of 5% sun is governed by high shunt resistance (R SH ) only, which satisfies standard testing conditions. At higher light intensities (25% sun), however, the cell exhibits lower but not insignificant efficiency (around 2%) governed by both the series (R S ) and the R SH . Minimal permeability in the UV region (up to 375 nm) and its almost constant value in the visible and the NIR region at low light intensity of 5% sun could be the reasons for higher cell efficiency. Copyright © 2015 John Wiley & Sons, Ltd. We showed that the cheap p‐doped and n‐doped Sb 2 S 3 ‐based hybrid solar cell made entirely of synthesized material works as an electricity generator and exhibits very high efficiency (around 8–9%) at very low light intensity of 5% sun. The efficiency of the designed cell is higher at weaker light intensity, probably because of different distribution of the visible part of the spectrum at the wavelengths that we have achieved with different lens systems, a plano‐convex and a biconvex lens, respectively. According to the analysis, high shunt resistance (even under STC conditions) at illumination of 5% sun causes a linear slope in the illuminated current‐voltage curve.


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    Title :

    High‐efficiency Sb2S3‐based hybrid solar cell at low light intensity: cell made of synthesized Cu and Se‐doped Sb2S3



    Published in:

    Publication date :

    2016




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    53.36 Energiedirektumwandler, elektrische Energiespeicher



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