29.58% (31.26)% -Limiting Highest Efficiencies obtained in the \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\mathbf{n}^+(\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\mathbf{p}^+)-\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\mathbf{p}(\\\\\\\\\\

In the n+(p+) − p(n) crystalline InP-junction solar cells, by basing on a same treatment method, and for a same heavy (low) doping effect, as those investigate in our recent papers [1, 2], but using now a new expression, obtained for the static relative dielectric constant ε rd a , determined exactly in the effective Bohr model, as that given in Eq. (1c), representing the donor (acceptor) d(a)-radius rd a − effect, or the ε rd a − effect, suggesting further that, for an increasing rd a , ε rd a decreases, as showed in Table 1, according to the increase in photovoltaic efficiency η, as that observed in Tables 2 and 3, we finally get, in our present paper, for highest values of rd a , the limiting highest efficiency results of such n+(p+) − p(n) crystalline InP-junction solar cells, η=29.58% (31.26%), respectively. SCIREA Journal of Physics ISSN: 2706-8862 http://www.scirea.org/journal/Physics October 23, 2022 Volume 7, Issue 5, October 2022 https://doi.org/10.54647/physics14491