Revisiting the theory and usage of junction capacitance: Application to high efficiency amorphous/crystalline silicon heterojunction solar cells - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Solar Energy Materials and Solar Cells Année : 2015

Revisiting the theory and usage of junction capacitance: Application to high efficiency amorphous/crystalline silicon heterojunction solar cells

Résumé

We briefly review the basic concepts of junction capacitance and the peculiarities related to amorphous semiconductors, paying tribute to Cohen and to his pioneering work. We extend the discussion to very high efficiency silicon heterojunction (SiHET) solar cells where both an amorphous semiconductor, namely hydrogenated amorphous silicon, and heterojunctions are present. By presenting both modeling and experimental results, we demonstrate that the conventional theory of junction capacitance based on the depletion approximation in the space charge region, cannot reproduce the capacitance data obtained on SiHET cells. The experimental temperature dependence is significantly stronger than that of the depletion-layer capacitance, while the bias dependence yields underestimated values of the diffusion potential, leading to strong errors if applied to the determination of band offsets using the procedure proposed precedingly in the literature. We demonstrate that this is not related to the amorphous nature of a-Si:H, but to the existence of a strongly inverted c-Si surface layer that requires minority carriers to be taken into account in the analysis of the junction capacitance.

Domaines

Matériaux
Fichier principal
Vignette du fichier
kleider_Sol_Mat_2015.pdf (679.53 Ko) Télécharger le fichier
Origine : Accord explicite pour ce dépôt
Loading...

Dates et versions

hal-01206182 , version 1 (23-03-2020)

Identifiants

Citer

Jean-Paul Kleider, José Alvarez, Aurore Brézard-Oudot, Marie-Estelle Gueunier-Farret, Olga Maslova. Revisiting the theory and usage of junction capacitance: Application to high efficiency amorphous/crystalline silicon heterojunction solar cells. Solar Energy Materials and Solar Cells, 2015, 135, pp.8-16. ⟨10.1016/j.solmat.2014.09.002⟩. ⟨hal-01206182⟩
123 Consultations
646 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More