Abstract— Compared to a single junction solar cell, a multijunction
(MJ) solar cell can extract higher energy from sun by
splitting the solar spectrum. Depending on the spectrum
splitting techniques, two different structures of MJ solar cells
are possible: vertical multijunction solar cell (VMJ) and lateral
multijunction solar cell (LMJ). Both of these structures have
their own advantages and limitations. LMJ solar cell has the
potential to emerge as an effective solution for solar energy
conversion although the availability of research materials on
LMJ is limited compared to that of VMJ. In this paper, a
complete photovoltaic (PV) power system constructed from
lateral multijunction solar cells is proposed along with a new
interconnection technique. The I/V characteristics of the solar
cells have been matched in the proposed interconnection using
a multi-input dc-dc converter. In order to ensure maximum
power point (MPP) operation, particle swarm optimization
algorithm is applied that requires only one maximum power
point control for four solar modules resulting in cost and
complexity reduction. Particle swarm optimization algorithm
has the potential to track the global maxima of the system even
under complex illumination situations. A complete functional
system with the implementation of the proposed algorithm has
been presented in this paper with relevant experimental results.