Opto-electrical simulation of III-V nanowire based tandem solar cells on Si - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2018

Opto-electrical simulation of III-V nanowire based tandem solar cells on Si

Résumé

Due to their nanostructured surface, nanowire-based solar cells are good candidates to increase light absorption in thin film solar cells. Among these structures, III-V nanowires grown on silicon substrates, in the form of a tandem solar cell, are particularly interesting to reach high efficiencies. The aim of this work is to perform optical and electrical simulations of tandem solar cells based on III-V nanowire arrays grown on silicon and to compare two different semiconductor compounds (GaAs0.8P0.2 and Ga0.8Al0.2As) with a band gap of 1.7 eV (optimal on Si) for the nanowire array.The simulated structure is composed of a periodic core-shell GaAs0.8P0.2 or Ga0.8Al0.2As nanowire (NW) array on a silicon substrate. In our simulations we are also taking into account a thin (5nm) passivating layer, the oxide used for the encapsulation of the nanowires and the top transparent conducting oxide. The height H of the nanowires is equal to 1.5 µm which is a realistic value from a technological point of view.Optical simulations are performed with an in-house Rigorous Coupled Wave Analysis (RCWA) software. To optimize the absorption of light in the structure, we are taking into account the current matching between the two solar cells in order to find the best geometry of the nanowire array. From the optical simulation, the generation rate is calculated and used as an input for the electrical simulation performed with the TCAD software Sentaurus. From the electrical simulation the power conversion efficiency is extracted for various doping profiles allowing its optimization. The influence of recombination in the multijunction structure are also analysed. Opto-electrical simulations demonstrate that optimal geometries and efficiencies are very similar for the two semiconductors used for the nanowires.

Dates et versions

hal-01959085 , version 1 (18-12-2018)

Identifiants

Citer

Vladimir Maryasin, Quentin Rafhay, D. Bucci, Jérôme Michallon, Anne Kaminski-Cachopo. Opto-electrical simulation of III-V nanowire based tandem solar cells on Si. SiliconPV 2018: 8th International Conference on Silicon Photovoltaics, Mar 2018, Lausanne, Switzerland. pp.120001, ⟨10.1063/1.5049318⟩. ⟨hal-01959085⟩
72 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More