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High efficiency multi-junction solar cells for concentrator photovoltaics

pubblicazioni - Presentazione

High efficiency multi-junction solar cells for concentrator photovoltaics

Con questo contributo sono introdotti i diversi approcci tecnologici per la realizzazione di celle solari multigunzione (MJ) ad alta efficienza, in particolare quello che riguarda lo sviluppo di celle a MJ ottenute combinando composti III-V con elementi IV. Questa soluzione amplia le possibilità ingegneristiche di band gap per ottenere dispositivi ad alta efficienza e allo stesso tempo consente di contenere i costi.

The success of concentrator photovoltaic (CPV) technology is due to the utilization of ultra-high efficient solar cells coupled with optical concentration. This technology is still in a pulsing development phase, in particular concerning the solar devices. For high concentration system ( > 300 X) a technology jump from three junction devices to four junction ones is near to be accomplished. In order to get this jump, two main technological paths are under development: the realization of “monolithic devices”, in which different materials are deposited on top of each other, exploiting a common substrate and the realization of “stacked” or “wafer bonded” devices, where single or tandem devices are deposited on different substrates and then are joined removing one of the substrate.

With this contribution the different technological approaches for realizing high efficiency Multi-junction solar cells will be first introduced and subsequently the presentation will be focalized on the frontier development of MJ to be realized by combining III-V compounds with IV elements. This solution expands the band gap engineering possibilities for getting high efficiency devices and, at the same time, allows keeping down the cost.

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