A comparison of some efficiency factors in photovoltaics

摘要: Shockley and Queisser, in their fundamental paper, defined an 'ultimate efficiency' eta ult, as the ratio of electrical output power (assuming voltage factor fill to be unity) radiative input maximum light concentration) ideal solar cell. The authors discuss this efficiency for a general density states g(x), where x=hv/kTp Tp is pump temperature. Its with respect variations bandgap Eg occurs at certain value Eg, say Eg0, yielding ult (xg0), xg0 identical Eg0/kTp. simple cell presence surroundings temperature Ts proportional (Tp,Ts) integral x(g)infinity ((1/(exp(x)-1))-(1/(exp(((x-v)/Ts)Tp)-1)))g(x) dx. xg nu max (Tp, Ts). They show that Shockley-Queisser same max, provided ambient set absolute zero temperature: (xg0)= 0). Comments are also made on: (i) possibility several maxima ult(xg0) appropriately chosen g(x); (ii) its dependence on number dimensions n=1,2,3,4,. . ., infinity : 29,39,44,48,. 100%, if g(x) due n-dimensional cube.