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Effect of ZnO‐based TCO on the performance of a‐Si H(n)/a‐Si H(i)/c‐Si H(p)/Al BSF(p+)/Al heterojunction solar cells
Author(s) -
Selmane Naceur,
Cheknane Ali,
Aillerie Michel,
Hilal Hikmat S.
Publication year - 2018
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13114
Subject(s) - materials science , solar cell , heterojunction , optoelectronics , energy conversion efficiency , quantum efficiency , wafer , amorphous silicon , current density , band diagram , silicon , photovoltaic system , solar cell efficiency , nanotechnology , crystalline silicon , electrical engineering , physics , quantum mechanics , engineering
Inclusion of ZnO‐based transparent conducting oxide (TCO) film layer into amorphous silicon/crystalline silicon (a‐Si/c‐Si) solar cell enhances its photovoltaic conversion efficiency. These findings have been confirmed here, using Afors HIT software. The simulation study is performed onto a solar cell that was originally lab prepared so as to use its measured parameters in the simulation. The ZnO‐based TCO films were electrodeposited on n‐type (100) silicon wafer and were simulated. X‐ray diffraction (XRD) pattern confirms the zinc blende nature of the TCO layer, and show that the preferred orientation of ZnO films is (002). Scanning electron microscopic (SEM) imaging confirms nano‐size nature of the ZnO based TCO film. For comparison purposes, cells with and without TCO layers are investigated by simulating photo‐current versus applied potential (J–V) plots. Values of fill factor ( FF ), short circuit current density ( J sc ) open circuit potential ( V CO ) and conversion efficiency ( η ) are extracted. The energy band diagram, current density and charge carrier generation/recombination phenomena are in‐depth analyzed to understand the mechanism of enhancement in the hetero‐junction cell performance. Values of quantum efficiency (QE) are also simulated. The results show that the solar cell heterojunction is hypersensitive to the ZnO layer. The added value of using the ZnO‐based transparent conductive oxide (TCO) layer, in enhancing intrinsic thin layer (HIT) solar cell conversion efficiency, is assessed by critically comparing it with a control cell having no ZnO layer. © 2018 American Institute of Chemical Engineers Environ Prog, 2018 © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13114, 2019