Advances in Solar Energy: An Annual Review of Research and by Yoshihiro Hamakawa, Hiroaki Okamoto (auth.), Karl W. Böer

By Yoshihiro Hamakawa, Hiroaki Okamoto (auth.), Karl W. Böer (eds.)

Advances in solar power, now in its 5th yr, is continuous with issues of the most box of solar power conversion. despite the fact that, as a result of expanding curiosity in a sunlight platforms process, we've got made up our minds to incorporate the object of Bockris et al., on Hydrogen know-how, which deals fascinating elements of delivery and garage of solar power, in addition to the potential of a flexible gasoline. the opposite articles conceal the sphere of photovoltaics, sunlight energy-related mate­ rials, wind conversion, sun retrofitting of current constructions, and new architectural designs in concord with weather and the relaxation of all occupants. those articles provide a serious overview of the current state-of-the-art, and supply a protracted checklist of literature for additional in-depth reviews. I enormously relish the help of the Editors and referees of the articles for his or her many optimistic feedback. My unique thank you visit Ms. Martha Hobbs for her committed paintings in typesetting the manuscript within the college of Delaware's e-book place of work, and to the collage of Delaware for his or her persevered help. The accommodating support from Plenum Press and its construction employees merits our thankful acknowledgement.

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CHAPTER 1 34 resents the dependence of the zero-field free-carrier generation probability PG(E~O) expressed by exp( ro / ro). A similar curve for the generation probabilityin the presence of a minimum electric field Emin within the i-layer of 5000 A thickness in an a-Si:H p-i-n junction structure is also drawn in the figure. As can be seen in this figure, PG(E=O) increases with higher photon energies (Hamakawa, 1982). Due to the surface recombination effect as well as a change in the effective hole diffusion length, the generation probability PG falls gradually with increasing levels of photon energy.

Chern. Res. 6 pm); V(x): BSREA, DR & DI, Estimate (upper limit) <~pr U;;VND ' 2n i <~pr u-;; vND . 4) Caused by a very short diffusion length and also a very high absorption coefficient in o:-Si solar cells, there exists a distinct difference between the photovoltaic mechanisms of single crystal p-n junctions and amorphous p-i-n junctions. 19a and b, c and d, respectively. As can be seen from these subfigures, AMORPHOUS SILICON SOLAR CELLS 25 p ( a) \ . n : . ~ 0 (e) I b) n ~I ~ ..... ( )i '~dri J d,/ ) ~ • .

EXPERIMENT ~ u \\. 26: Theoretical and experimental collection efficiency spectra of a-Si:H p-i-n junction. S u iL u. 21: Relationship between the thermalization distance TO and collection efficiency T/c(hw) for an a-Si:H p-i-n junction cell for varying photon energy. 7 a. ) and E Emin(o) as a function of photon excitation with Lp = 1000 A. , 1981). CHAPTER 1 34 resents the dependence of the zero-field free-carrier generation probability PG(E~O) expressed by exp( ro / ro). A similar curve for the generation probabilityin the presence of a minimum electric field Emin within the i-layer of 5000 A thickness in an a-Si:H p-i-n junction structure is also drawn in the figure.

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