2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
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    Investigating Reasons for Poor Performance of CdS/p-SnS Solar Cells
    Yashika Gupta1; Arun Palakkandy2;
    1UNIVERSITY OF DELHI, Delhi, India; 2S.G.T.B. KHALSA COLLEGE, UNIVERSITY OF DELHI, Delhi, India;
    PAPER: 190/AdvancedMaterials/Regular (Oral)
    SCHEDULED: 14:00/Wed./Grego (50/3rd)



    ABSTRACT:
    Search for an efficient and low cost alternative to Silicon-wafer solar cells has led to the popularity of thin film photovoltaics. Tin Sulphide (SnS), being an earth abundant, cheap, and less toxic semiconducting material [1,2] with a high absorption coefficient (> 104 cm-1) in visible range [3], stands out as a potential candidate. Theoretical simulations by Loferski et al. [4] predicted 24% efficiency for SnS based solar cells, however maximum efficiency achieved to date is far less than the predicted value. In this work, a detailed analysis of the poor performance of CdS/p-SnS heterojunction solar cells is carried out. ITO/CdS/p-SnS/Au solar cells with varying thickness of p-SnS absorber layer were made using a thermal evaporation technique. Best conversion efficiency of 0.005% was obtained for the cell having p-SnS layer of thickness 1068nm. Defects present in p-SnS thin films along with the band misalignment at the interface of CdS/SnS layers lead to poor performance of the cell by increasing the trap-assisted tunneling recombinations at the junction. Ideality factor was calculated from the dark J-V characteristics, using the modified piecewise model [5] to quantify the junction characteristics. It was found that the ideality factor has a direct impact on the device performance, with efficiency decreasing as the ideality factor of the junction increases.

    References:
    [1] H.Noguchi, A.Setiyadi, H.Tanamura, T.Nagatomo, O.Omoto, Sol. Energ. Mater. Sol. Cells 35 (1994) 325.
    [2] C.Gao, H.Shen, L.Sun, Z.Chen, Mater. Lett. 65 (2011) 1413.
    [3] G.H.Yue, D.L.Peng, P.X.Yan, L.S.Wang, W.Wang, X.H.Luo, Alloys Compd. 468 (2009) 254.
    [4] J.J.Loferski, J. Appl. Phys. 27 (1956) 777.
    [5] Y.Gupta, P.Arun, JAPED (accepted, 2017).