a-Si/SiNx multilayered light absorber for solar cell
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- Panchal, A.K., Rai, D.K., Mathew, M. et al. J Nanopart Res (2011) 13: 2469. doi:10.1007/s11051-010-0139-4
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40 alternate a-Si/SiNx multilayer are incorporated as an absorber layer in a p–i–n solar cell. The device is fabricated using hot-wire chemical vapor deposition (HWCVD) technique. The structure of the multilayer film is examined by high resolution transmission electron microscopy (HR-TEM) which shows distinct formation of alternate a-Si and SiNx layers. The a-Si and SiNx layers have thickness of ~3.5 and 4 nm, respectively. The photoluminescence (PL) of multilayer film shows bandgap energy of ~2.52 eV, is larger than that of the c-Si and a-Si. Dark and illuminated current–voltage (I–V) characterization of the ML films shows that these ML are photosensitive. In the present work, it is seen that the p–i–n structure with i-layer as ML quantum well (QW) structures show photovoltaic effect with relatively high open-circuit voltage (VOC). The increment of bandgap energy in PL and high VOC of the device is attributed to the quantum confinement effect (QCE).