Photoimpedance Spectroscopy Analysis of Planar and Nano-Textured Thin-Film Silicon Solar Cells

Authors: P. Kumar, D. Eisenhauer, M. M. K. Yousef, Q. Shi, A. S. G. Khalil, M. R. Saber, C. Becker, T. Pullerits, K. J. Karki

Abstract:

In impedance spectroscopy (IS) the response of a photo-active device is analysed as a function of ac bias. It is widely applied in a broad class of material systems and devices. It gives access to fundamental mechanisms of operation of solar cells. We have implemented a method of IS where we modulate the light instead of the bias. This scheme allows us to analyze not only carrier dynamics but also impedance of device locally. Here, using this scheme, we have measured the frequency-dependent photocurrent response of the thin-film planar and nano-textured Si solar cells using this method. Photocurrent response is measured in range of 50 Hz to 50 kHz. Bode and Nyquist plots are used to determine characteristic lifetime of both the cells. Interestingly, the carrier lifetime of both planar and nano-textured solar cells depend on back and front contact positions. This is due to either heterogeneity of device or contacts are not optimized. The estimated average lifetime is found to be shorter for the nano-textured cell, which could be due to the influence of the textured interface on the carrier relaxation dynamics.

Keywords: Carrier lifetime, Impedance, nano-textured, and photocurrent.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1316460

References:

[1] I. Mora-Sero, G. Garcia-Belmonte, P. P. Boix, M. A. Vazquez and J. Bisquert, "Impedance spectroscopy characterisation of highly efficient silicon solar cells under different light illumination intensities," Energy Environ. Sci. 2(6), 678-686 (2009).
[2] J. Bisquert and V. S. Vikhrenko, "Interpretation of the Time Constants Measured by Kinetic Techniques in Nanostructured Semiconductor Electrodes and Dye-Sensitized Solar Cells," J. Phys. Chem. B 108(7), 2313-2322 (2004).
[3] J. Bisquert, G. Garcia-Belmonte, F. Fabregat-Santiago, N. S. Ferriols, P. Bogdanoff and E. C. Pereira, "Doubling Exponent Models for the Analysis of Porous Film Electrodes by Impedance. Relaxation of TiO2 Nanoporous in Aqueous Solution," J. Phys. Chem. B 104(10), 2287-2298 (2000).
[4] S. Soedergren, A. Hagfeldt, J. Olsson and S.-E. Lindquist, "Theoretical Models for the Action Spectrum and the Current-Voltage Characteristics of Microporous Semiconductor Films in Photoelectrochemical Cells," J. Phys. Chem. 98(21), 5552-5556 (1994).
[5] L. Dloczik, O. Ileperuma, I. Lauermann, L. M. Peter, E. A. Ponomarev, G. Redmond, N. J. Shaw and I. Uhlendorf, "Dynamic Response of Dye-Sensitized Nanocrystalline Solar Cells: Characterization by Intensity-Modulated Photocurrent Spectroscopy," J. Phys. Chem. B 101(49), 10281-10289 (1997).
[6] L. Bay and K. West, "An equivalent circuit approach to the modelling of the dynamics of dye sensitized solar cells," Sol. Energy Mater. Sol. Cells 87(1-4), 613-628 (2005).
[7] L. Peter, "Transport, trapping and interfacial transfer of electrons in dye-sensitized nanocrystalline solar cells," J. Electroanal. Chem. 599(2), 233-240 (2007).
[8] B. Tripathi, P. Yadav and M. Kumar, "Charge transfer and recombination kinetics in dye-sensitized solar cell using static and dynamic electrical characterization techniques," Sol. Energy 108(107-116 (2014).
[9] B. H. Hamadani, J. Roller, P. Kounavis, N. B. Zhitenev and D. J. Gundlach, "Modulated photocurrent spectroscopy of CdTe/CdS solar cells-equivalent circuit analysis," Sol. Energy Mater. Sol. Cells 116(126-134 (2013).
[10] Klaus Jäger, Grit Köppel, D. Eisenhauer, D. Chen, M. Hammerschmidt, S. Burger and C. Becker, "Optical simulations of advanced light management for liquid-phase crystallized silicon thin-film solar cells," in SPIE Nanoscience + Engineering, p. 7, Proc. SPIE (2017).
[11] D. Eisenhauer, K. Jaeger, G. Koeppel, B. Rech and C. Becker, "Optical Properties of Smooth Anti-Reflective Three-Dimensional Textures for Silicon Thin-film Solar Cells," Energy Procedia 102(27-35 (2016).
[12] G. Koeppel, D. Eisenhauer, B. Rech and C. Becker, "Tailoring Nano-Textures for Optimized Light In-Coupling in Liquid Phase Crystallized Silicon Thin-Film Solar Cells," Phys. Status Solidi C 14(10), n/a (2017).
[13] D. Eisenhauer, G. Köppel, K. Jäger, D. Chen, O. Shargaieva, P. Sonntag, D. Amkreutz, B. Rech and C. Becker, "Smooth anti-reflective three-dimensional textures for liquid phase crystallized silicon thin-film solar cells on glass," Scientific Reports 7(1), 2658 (2017).
[14] G. Koppel, D. Eisenhauer, B. Rech and C. Becker, "Combining tailor-made textures for light in-coupling and light trapping in liquid phase crystallized silicon thin-film solar cells," Opt Express 25(12), A467-A472 (2017).
[15] A. Zohar, N. Kedem, I. Levine, D. Zohar, A. Vilan, D. Ehre, G. Hodes and D. Cahen, "Impedance Spectroscopic Indication for Solid State Electrochemical Reaction in (CH3NH3)PbI3 Films," J. Phys. Chem. Lett. 7(1), 191-197 (2015).
[16] Q. Wang, J.-E. Moser and M. Graetzel, "Electrochemical Impedance Spectroscopic Analysis of Dye-Sensitized Solar Cells," J. Phys. Chem. B 109(31), 14945-14953 (2005).
[17] K. Khadga Jung, K. Loni, H. M. Andrew and T. Pullerits, "Phase-synchronous detection of coherent and incoherent nonlinear signals," Journal of Optics 18(1), 015504 (2015).
[18] K. J. Karki, M. Abdellah, W. Zhang and T. n. Pullerits, "Different emissive states in the bulk and at the surface of methylammonium lead bromide perovskite revealed by two-photon micro-spectroscopy and lifetime measurements," APL Photonics 1(4), 046103 (2016).
[19] V. A. Osipov, X. Shang, T. Hansen, T. n. Pullerits and K. J. Karki, "Nature of relaxation processes revealed by the action signals of intensity-modulated light fields," Phys. Rev. A 94(5), 053845 (2016).
[20] S. Fu, A. Sakurai, L. Liu, F. Edman, T. Pullerits, V. Öwall and K. J. Karki, "Generalized lock-in amplifier for precision measurement of high frequency signals," Rev. Sci. Instrum. 84(11), 115101 (2013).
[21] K. Karki, M.Torbjörnsson, J. R. Widom, A. H. Marcus and T. Pullerits, "Digital cavities and their potential applications," J. Instrum. 8(05), T05005 (2013).
[22] A. Jin, S. Fu, A. Sakurai, L. Liu, F. Edman, T. Pullerits, V. Öwall and K. J. Karki, "Note: High precision measurements using high frequency gigahertz signals," Rev. Sci. Instrum. 85(12), 126102 (2014).
[23] F. Fabregat-Santiago, G. Garcia-Belmonte, I. Mora-Sero and J. Bisquert, "Characterization of nanostructured hybrid and organic solar cells by impedance spectroscopy," Phys. Chem. Chem. Phys. 13(20), 9083-9118 (2011).
[24] J. Carstensen, E. Foca, S. Keipert, H. Foell, M. Leisner and A. Cojocaru, "New modes of FFT impedance spectroscopy applied to semiconductor pore etching and materials characterization," Phys. Status Solidi A 205(11), 2485-2503 (2008).
[25] J. F. Rubinson and Y. P. Kayinamura, "Charge transport in conducting polymers: insights from impedance spectroscopy," Chem. Soc. Rev. 38(12), 3339-3347 (2009).