, nous avons effectué à chaque fois la modélisation pour les deux cas. C'est-à-dire lorsque N l est dopé p (dopé n), nous supposons une jonction p-n + (n-p + ) et donc utilisons le modèle Masetti afin de définir la mobilité des PCM donc des électrons (trous)
, Résultats de modélisation : confrontation à l'expérimental Cette sous-section confronte le modèle OCVD développé sous Python à la caractérisation expérimentale d'une diode silicium du commerce (Vishay 1N4007) dont on ne connaît absolument rien du design (épaisseur, dopage, contacts)
, Dans un premier temps, on a fixé R sh et fait varier ? OCVD , N l et V bi
, En regardant les valeurs finales des paramètres d'ajustement données dans le tableau V.10, colonne Si 1 , on observe que ? OCVD et N l restent cohérents (autour de 6 µs et de 1 × 10 12 cm ?3 ), et identiques dans les deux hypothèses. En revanche, le V bi est bien trop important. En effet, d'après l'équation III.11, pour N l = 2 × 10 12 cm ?3 , V bi est maximale pour N h = 5 × 10 20 cm ?3 et vaut 0,766 V<E G(Si) . C'est précisément dans ce cas de figure qu'il serait intéressant d'utiliser un algorithme permettant de borner les variables. De plus, il n'est pas vraiment possible d'après les résultats, 2017.
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, Nous nous intéressons aux semiconducteurs III-V puisqu'ils sont utilisés dans les cellules multijonctions dédiées au CPV. Afin de déterminer la durée de vie dans ces matériaux, le signal OCVD doit être modélisé. Pour ce faire, nous avons tout d'abord utilisé la simulation TCAD pour étudier l'influence du design (épaisseur du bulk et dopage de l'émetteur) de jonctions p-n en silicium et en GaAs sur le signal OCVD. Nous avons travaillé sur l'extraction de la durée de vie dans une région spécifique : le bulk, Résumé Mesurer la durée de vie des porteurs minoritaires est indispensable pour optimiser les cellules PV
Ceci nous a permis de mettre en évidence l'importance de la diode anti-retour dans le circuit OCVD. Son temps de blocage doit être inférieur à la durée de vie à mesurer. Enfin, nous avons développé, sur la base du modèle équivalent à une diode en régime transitoire ,
Mots clés : porteurs de charge minoritaires, durée de vie, décroissance de la tension en circuit ouvert, OCVD, GaSb, GaAs, silicium, simulation, TCAD, Python, CPV, multijonction. Abstract Minority carrier lifetime measurement is essential to optimize PV solar cells. The OCVD method allows it into p-n junction. Compare to other technics widely used like PCD or TRPL, it is really simple and cheap. However it has been scarcely used for III-V materials mainly due to their low lifetime (< 1 µs). We focus on III-V semiconductors because they are good candidates to multijunction solar cells dedicated to CPV. Nevertheless, the OCVD signal must be simulated in order to extract lifetime in these materials. Therefore, we first used TCAD simulation to study design influence (bulk thickness and emitter doping) of silicon and GaAs p-n junctions on OCVD signal ,
It allowed to highlight the blocking diode is of major importance. Its blocking time has to be shorter than measured lifetime. Finally, we developed a model under Python based on transient single-diode model. It enables first to simulate OCVD signal, then to fit experimental curve with several fitting variables (? OCVD , N l et R sh ). This modelling allowed to study further the variable influences on the signal and thus improved our knowledge on OCVD behaviour. Keywords : minority charge carriers, lifetime, junctions have been fitted by TCAD simulation ,