Performance Analysis of Ultrathin Cu(In,Ga)Se2 Solar Cells with Backwall Superstrate Configuration Using AMPS-1D
Received: 17 September 2022 | Revised: 29 September 2022 | Accepted: 3 October 2022 | Online: 15 December 2022
Corresponding author: A. Mouhoub
Abstract
This study used AMPS-1D to peform numerical simulations and model the behavior of back-wall superstrate solar cells based on Cu(In,Ga)Se2 (CIGS) thin films to investigate optimal conditions and obtain maximum efficiency. The effects of absorber thickness and density of interface defects were examined along with the work function of the transparent conductive oxide (WTCO) to investigate their influence on the output parameters. Measurements of device performance (J-V) and Quantum Efficiency (QE) showed that the performance of the cell improved as the thickness of the CIGS layer decreased because photons were absorbed near the junction. The device achieved an efficiency of 16.4% using an optimal thickness for the CIGS layer on the order of 0.3µm, defect densities in the range of 1013-1015cm-3, doping concentration of the n-TCO back contact on the order of 1019cm-3, and WTCO in the range of 4.5-5.2eV. These results show that the generated electron-hole pairs had a high probability of separation and demonstrate the potential of this device structure.
Keywords:
Cu(In,Ga)Se2, thin films solar cells, backwall superstrate, transparent conductive oxide, device modelingDownloads
References
M. Ni, J. M. Liu, Z. Q. Li, Q. Shen, Y. Z. Feng, and X. D. Feng, "Simulation of graded bandgap on backwall superstrate CIGS solar cells with MoOx electron reflection layer," Materials Research Express, vol. 6, no. 11, Jul. 2019, Art. no. 116441. DOI: https://doi.org/10.1088/2053-1591/ab4c5c
J. K. Larsen, H. Simchi, P. Xin, K. Kim, and W. N. Shafarman, "Backwall superstrate configuration for ultrathin Cu(In,Ga)Se2 solar cells," Applied Physics Letters, vol. 104, no. 3, Jan. 2014, Art. no. 033901. DOI: https://doi.org/10.1063/1.4862651
S. M. Ho, "Fabrication of Cu4SnS4 Thin Films: Α Review," Engineering, Technology & Applied Science Research, vol. 10, no. 5, pp. 6161–6164, Oct. 2020. DOI: https://doi.org/10.48084/etasr.3663
C. Zhang et al., "High efficiency CIGS solar cells on flexible stainless steel substrate with SiO2 diffusion barrier layer," Solar Energy, vol. 230, pp. 1033–1039, Dec. 2021. DOI: https://doi.org/10.1016/j.solener.2021.11.006
S. E. T. Moghaddam and S. M. Kankanani, "Numerical Simulation of a Mechanically Stacked GaAs/Ge Solar Cell," Engineering, Technology & Applied Science Research, vol. 7, no. 3, pp. 1611–1614, Jun. 2017. DOI: https://doi.org/10.48084/etasr.935
W. S. Liu, H. C. Hu, N. W. Pu, and S. C. Liang, "Developing flexible CIGS solar cells on stainless steel substrates by using Ti/TiN composite structures as the diffusion barrier layer," Journal of Alloys and Compounds, vol. 631, pp. 146–152, May 2015. DOI: https://doi.org/10.1016/j.jallcom.2014.12.189
M. D. Heinemann et al., "Cu(In,Ga)Se2 superstrate solar cells: prospects and limitations," Progress in Photovoltaics: Research and Applications, vol. 23, no. 10, pp. 1228–1237, 2015. DOI: https://doi.org/10.1002/pip.2536
C. H. Huang, "Effects of junction parameters on Cu(In,Ga)Se2 solar cells," Journal of Physics and Chemistry of Solids, vol. 69, no. 2, pp. 779–783, Feb. 2008. DOI: https://doi.org/10.1016/j.jpcs.2007.07.118
A. Mavlonov et al., "Superstrate-type flexible and bifacial Cu(In,Ga)Se2 thin-film solar cells with In2O3:SnO2 back contact," Solar Energy, vol. 211, pp. 725–731, Nov. 2020. DOI: https://doi.org/10.1016/j.solener.2020.10.019
T. Nakada, "Microstructural and diffusion properties of CIGS thin film solar cells fabricated using transparent conducting oxide back contacts," Thin Solid Films, vol. 480–481, pp. 419–425, Jun. 2005. DOI: https://doi.org/10.1016/j.tsf.2004.11.142
X. Li, A. Kanevce, J. V. Li, and I. Repins, "The impact of front contact ZnO:Al/Zn1-xMgxO layer on Cu(In,Ga)Se2 thin-film solar cells," physica status solidi c, vol. 7, no. 6, pp. 1703–1705, 2010. DOI: https://doi.org/10.1002/pssc.200983225
A. Chirilă et al., "Highly efficient Cu(In,Ga)Se2 solar cells grown on flexible polymer films," Nature Materials, vol. 10, no. 11, pp. 857–861, Nov. 2011. DOI: https://doi.org/10.1038/nmat3122
P. Jackson, R. Wuerz, D. Hariskos, E. Lotter, W. Witte, and M. Powalla, "Effects of heavy alkali elements in Cu(In,Ga)Se2 solar cells with efficiencies up to 22.6%," physica status solidi (RRL) – Rapid Research Letters, vol. 10, no. 8, pp. 583–586, 2016. DOI: https://doi.org/10.1002/pssr.201600199
M. Paire, L. Lombez, J.-F. Guillemoles, and D. Lincot, "Toward microscale Cu(In,Ga)Se2 solar cells for efficient conversion and optimized material usage: Theoretical evaluation," Journal of Applied Physics, vol. 108, no. 3, Aug. 2010, Art. no. 034907. DOI: https://doi.org/10.1063/1.3460629
D. L. Young et al., "Improved performance in ZnO/CdS/CuGaSe2 thin-film solar cells," Progress in Photovoltaics: Research and Applications, vol. 11, no. 8, pp. 535–541, 2003. DOI: https://doi.org/10.1002/pip.516
T. Nakada, Y. Hirabayashi, T. Tokado, D. Ohmori, and T. Mise, "Novel device structure for Cu(In,Ga)Se2 thin film solar cells using transparent conducting oxide back and front contacts," Solar Energy, vol. 77, no. 6, pp. 739–747, Dec. 2004. DOI: https://doi.org/10.1016/j.solener.2004.08.010
F.-J. Haug, D. Rudmann, H. Zogg, and A. N. Tiwari, "Light soaking effects in Cu(In,Ga)Se2 superstrate solar cells," Thin Solid Films, vol. 431–432, pp. 431–435, May 2003. DOI: https://doi.org/10.1016/S0040-6090(03)00187-1
M. D. Heinemann et al., "Advantageous light management in Cu(In,Ga)Se2 superstrate solar cells," Solar Energy Materials and Solar Cells, vol. 150, pp. 76–81, Jun. 2016. DOI: https://doi.org/10.1016/j.solmat.2016.02.005
S. Ikeda, R. Kamai, S. Min Lee, T. Yagi, T. Harada, and M. Matsumura, "A superstrate solar cell based on In2(Se,S)3 and CuIn(Se,S)2 thin films fabricated by electrodeposition combined with annealing," Solar Energy Materials and Solar Cells, vol. 95, no. 6, pp. 1446–1451, Jun. 2011. DOI: https://doi.org/10.1016/j.solmat.2010.11.006
M. D. Heinemann et al., "The Importance of Sodium Control in CIGSe Superstrate Solar Cells," IEEE Journal of Photovoltaics, vol. 5, no. 1, pp. 378–381, Jan. 2015. DOI: https://doi.org/10.1109/JPHOTOV.2014.2360332
A. Mouhoub, A. Bouloufa, K. Djessas, and A. Messous, "Analytical modeling and optimization of original bifacial solar cells based on Cu(In,Ga)Se2 thin films absorbers," Superlattices and Microstructures, vol. 122, pp. 434–443, Oct. 2018. DOI: https://doi.org/10.1016/j.spmi.2018.06.068
A. Mouhoub, A. Bouloufa, K. Djessas, and A. Messous, "Device modeling approach and simulation of the effect of the ODC thin layer on bifacial solar cells based on CuIn1-xGaxSe2 thin films absorbers," Journal of Physics and Chemistry of Solids, vol. 144, p. 109520, Sep. 2020. DOI: https://doi.org/10.1016/j.jpcs.2020.109520
A. Morales-Acevedo, N. Hernández-Como, and G. Casados-Cruz, "Modeling solar cells: A method for improving their efficiency," Materials Science and Engineering: B, vol. 177, no. 16, pp. 1430–1435, Sep. 2012. DOI: https://doi.org/10.1016/j.mseb.2012.01.010
C. H. Huang, "Effects of Ga content on Cu(In,Ga)Se2 solar cells studied by numerical modeling," Journal of Physics and Chemistry of Solids, vol. 69, no. 2, pp. 330–334, Feb. 2008. DOI: https://doi.org/10.1016/j.jpcs.2007.07.093
I. Bouchama, K. Djessas, F. Djahli, and A. Bouloufa, "Simulation approach for studying the performances of original superstrate CIGS thin films solar cells," Thin Solid Films, vol. 519, no. 21, pp. 7280–7283, Aug. 2011. DOI: https://doi.org/10.1016/j.tsf.2011.01.182
A. Bouloufa, K. Djessas, and D. Todorovic, "Structural and optical properties of Cu(In,Ga)Se2 grown by close-spaced vapor transport technique," Materials Science in Semiconductor Processing, vol. 12, no. 1, pp. 82–87, Feb. 2009. DOI: https://doi.org/10.1016/j.mssp.2009.07.010
M. Nerat, F. Smole, and M. Topič, "A simulation study of the effect of the diverse valence-band offset and the electronic activity at the grain boundaries on the performance of polycrystalline Cu(In,Ga)Se2 solar cells," Thin Solid Films, vol. 519, no. 21, pp. 7497–7502, Aug. 2011. DOI: https://doi.org/10.1016/j.tsf.2010.12.100
T. B. Nasrallah, D. Mahboub, M. Jemai, and S. Belgacem, "Temperature Effect on Al/p-CuInS2/SnO2(F) Schottky Diodes," Engineering, Technology & Applied Science Research, vol. 9, no. 5, pp. 4695–4701, Oct. 2019. DOI: https://doi.org/10.48084/etasr.3072
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