Deep Impact of the n-c-Si Defect Density on Heterojunction with Intrinsic Thin Layer Solar Cells
| Authors | Z. Dahlal1 , F. Hamdache1 , D. Rached1 , W.L. Rahal2,3 |
| Affiliations |
1Laboratoire de Physique des Plasmas, Matériaux Conducteurs et Leurs Applications,U.S.T.O.M.B. – B.P. 1505, El M’naouar, Oran, Algérie 2Laboratoire d’Analyse et d’Application des Rayonnements, U.S.T.O.M.B. – B.P. 1505, El M’naouar, Oran, Algérie 3Département de Physique, Faculté des Sciences Exactes et de l’Informatique, Université Abdelhamid Ibn Badis de Mostaganem, Algérie |
| Е-mail | leila.rahal@univ-mosta.dz |
| Issue | Volume 13, Year 2021, Number 6 |
| Dates | Received 16 January 2021; revised manuscript received 01 December 2021; published online 20 December 2021 |
| Citation | Z. Dahlal, F. Hamdache, D. Rached, et al., J. Nano- Electron. Phys. 13 No 6, 06001 (2021) |
| DOI | https://doi.org/10.21272/jnep.13(6).06001 |
| PACS Number(s) | 73.61.Jc, 71.20.Mq, 88.40.jj, 88.40.hj |
| Keywords | HIT solar cells, Silicon (58) , Defect density, SCAPS-1D (22) , Current density-voltage (J-V) characteristic. |
| Annotation |
In this work, a Heterojunction with Intrinsic Thin layer (HIT) n-c-Si solar cell: Indium Tin Oxide (ITO)/hydrogenated p-doped amorphous silicon (p-a-Si:H)/hydrogenated intrinsic polymorphous silicon (i-pm-Si:H)/n-doped crystalline silicon (n-c-Si)/Aluminum (Al) has been optimized. Using solar cell capacitance simulator (SCAPS-1D), we have studied the effect of defect density in the bulk (Nt) and at the surface (Nss) of the n-c-Si active layer on the current density-voltage (J-V) characteristic (open-circuit voltage, short-circuit current density, Fill Factor and efficiency). To calculate the values of Nss, we have taken the average between the density of states Gmg located in the band gap (U-shaped model) and the total density of states Ntot (Urbach tails) that we have multiplied by the thickness of the defective layer. We have shown that for a defective surface thickness of 32 Å between hydrogenated polymorphous silicon and crystalline silicon (i-pm-Si:H/n-c-Si), the density of states Gmg located in the band gap and the density of states Ntot at Urbach tails must be equal to 3.51017 cm – 3 and 2.81017 cm – 3, respectively (using U-shaped model). We conclude that the surface of the active layer must be passivated so as to have Nss less than 1011 cm – 2. Then, the lifetime of the minority carriers in the active layer (n-c-Si) must be greater than 1 ms. Indeed, an efficiency of 22.08 % was obtained for Nss = 1010 cm – 2, = 5 ms. |
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List of References |
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