  We explore the possibility to use advanced germanium (Ge) detectors as a
low-energy solar neutrino observatory by means of neutrino-nucleus elastic
scattering. A Ge detector utilizing internal charge amplification for the
charge carriers created by the ionization of impurities is a novel technology
with experimental sensitivity for detecting low-energy solar neutrinos. Ge
internal charge amplification (GeICA) will amplify the charge carriers induced
by neutrino interacting with Ge atoms through emission of phonons. It is those
phonons that will create charge carriers through the ionization of impurities
to achieve an extremely low energy threshold of $\sim$0.01 eV. We demonstrate
the phonon absorption, excitation, and ionization probability of impurities in
a Ge detector with impurity levels of 3$\times$10$^{10}$ cm$^{-3}$,
9$\times$10$^{10}$ cm$^{-3}$, and 2$\times$10$^{11}$ cm$^{-3}$. We present the
sensitivity of such a Ge experiment for detecting solar neutrinos in the
low-energy region. We show that, if GeICA technology becomes available, then a
new opportunity arises to observe $pp$ and 7Be solar neutrinos. Such a novel
detector with only 1 kg of high-purity Ge will give $\sim$ 10 events per year
for $pp$ neutrinos and $\sim$ 5 events per year for 7Be neutrinos with a
detection energy threshold of 0.01 eV.
