  In this work, it is investigated the behavior of the efficiency at maximum
power of a quantum dot molecule, acting as a device for photovoltaic
conversion. A theoretical approach using a master equation, considering the
effect of the energy offsets, and the width of the quantum barrier, identifies
realistic physical conditions that enhance the photovoltaic response of the
photocell. The results show the potentiality of increasing the gain in 30\% of
maximum power delivered per molecule if compared with a single quantum dot.
Also, the system exhibits gain when compared to the Chambadal-Novikov
efficiency at maximum power, without exceeding Carnot's efficiency, as expected
from the second law of thermodynamics.
