Effect of front surface light trapping structures on the PERC solar cell
- PDF / 2,499,028 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 33 Downloads / 215 Views
Effect of front surface light trapping structures on the PERC solar cell Jicheng Zhou1 · Yong Tan1 · Wenfeng Liu2 · Xianwu Cai2 · Hailong Huang2 · Yujin Cao1 Received: 18 December 2019 / Accepted: 26 March 2020 © Springer Nature Switzerland AG 2020
Abstract Properties of the front textured surface shape and anti-reflection coating have a great impact on the performance of solar cells. In this paper, the simulation model of the minimum unit cell structure is established and validated, which is based on the framework of Silvaco software and basic parameters of the standard pyramid textures single crystalline silicon PERC solar cell. The effect of the front surface light trapping structures on cell performance is discussed. It is found that the slightly concave pyramid-like textures can improve the response for short wavelengths and the short-circuit current density of the cell is increased by 0.3 mA/cm2, which is improved by 0.80%. In addition, by properly controlling the preparation process of the anti-reflection coating, a gradient-index S iOxNy/Si3N4 double-layer anti-reflection coating (DLARC) can be formed, which can significantly reduce the reflectivity for short wavelengths. And the short-circuit current density of the cell can be increased by 0.32 mA/cm2, which is improved by 0.86%. Finally, the optimized slightly concave pyramid-like textures and the SiOxNy/Si3N4 DLARC can improve the photoelectric conversion efficiency of the PERC solar cell by 0.18% and 0.20%, respectively. Keywords PERC solar cell · Light trapping · Texturing · Anti-reflection coating · Device simulation
1 Introduction PERC (Passivated Emitter and Rear Cell) structure was initially developed in 1989 by University of New South Wales in lab scale [1] and later implemented industrially by the Fraunhofer ISE in 2002 with the pilot-line laser fired contact process [2]. Nowadays, PERC technology has become one of the most cost-effective solutions of high-efficiency c-Si solar cells. The advantage of the PERC solar cell is mainly embodied in its low back surface recombination velocity (SRV). As early as 2006, Hoex et al. [3] utilized Al2O3 films prepared by low-temperature plasma-assisted atomic layer deposition (PA-ALD) to reduce the effective SRVs of p-type c-Si to 13 cm/s. Later, Institute for Solar Energy Hamelin (ISFH) reduce the back SRVs of low resistivity p-type c-Si PERC cells to less than 10 cm/s with the highly effective back passivation technology of Al2O3/SiNx stacks [4, 5]. With the process of the back side of c-si solar cells being
perfected [6, 7], researchers try to focus back on the front surface of c-si solar cells. In 2011, Baker-Finchby et al. [8] studied the light trapping paths of the pyramid texture by identifying discrete paths of reflection and the fraction of the reflected light that follows each of these paths, finding that a regular array of inverted pyramids just outperforms a random array of upright pyramids. In 2013, Kim et al. [9] combined the experiment with Silvaco simulation to study the effect of th
Data Loading...
