β Scribed by Masafumi Yamaguchi
No coin nor oath required. For personal study only.
The present status of R& D program for super-high e ciency III-V compound multi-junction solar cells in the New Sunshine Project in Japan is presented. As a result of InGaP top cell material quality improvement, development of optically and electrically low-loss double-heterostructure InGaP tunnel junction, photon and carrier conΓΏnements, and lattice matching between active cell layers and substrate, InGaP=InGaAs=Ge monolithic cascade 3-junction cells with an e ciency of 31.7% at 1-sun AM1.5 and InGaP=GaAs==InGaAs mechanically stacked 3-junction cells with the highest (world-record) e ciency of 33.3% at 1-sun AM1.5 have been realized. As an approach for low-cost and high-e ciency cells, better radiation resistance of GaAs thin-ΓΏlm solar cells with novel structures fabricated on Si substrates has also been demonstrated. Novel structures such as Bragg re ector and super-lattice structures are found to show a better initial cell performance and radiation resistance since those layers act as bu er layers to reduce dislocations, and act as a back-surface ΓΏeld and back-surface re ector layers.
π SIMILAR VOLUMES
## Abstract The emerging field of stacked layers (doubleβ and even multiβlayers) in organic photovoltaic cells is reviewed. Owing to the limited absorption width of organic molecules and polymers, only a small fraction of the solar flux can be harvested by a singleβlayer bulk heterojunction photovo
Aimtract-Triple-junction (p-i-XI)~ photovoltaic devices, based on hydrogenated amorphous silicon thin tilmq have been prepared, exhibiting open-circuit voltages larger than 2 V, short-circuit currents of about SmAcm-' and overall photovoltaic e5ciencies higher than 6%. Such units can sustain water e
Records in PV do not endure. The previous record -also held by Spectrolab -was 35.2% efficiency. Although one might think it likely that the latest result will last for some time, such is its significance, the company thinks that it can surpass 36.9% within the coming year or so. Spectrolab says th