MECHANISMS OF FORMATION OF ANOMALOUS PHOTOINTENSIFICATION EFFECT IN Si/ORGANIC HETEROSTRUCTURES BASED ON PENTACENE AND CuPc LAYERS

Abstract

This scientific work studies the photovoltaic processes in hybrid heterostructures
formed by integrating organic layers such as pentacene and copper phthalocyanine (CuPc) into silicon
(Si)-based semiconductor systems. The main focus of the study is on the theoretical and experimental
analysis of the physical mechanisms of the anomalous photovoltage (APV) effect observed in these
multilayer structures. As a result of the research, it was found that the singlet fission phenomenon
occurring in the pentacene layer is of great importance. This quantum mechanical process ensures the
conversion of one singlet exciton into two triplet excitons, significantly increasing the overall
generation efficiency of charge carriers in the system. This, in turn, serves to increase the coefficient
of conversion of solar energy into electrical energy.
The role of the CuPc layer in the heterostructure was studied in detail. It was found that this
layer acts as a buffer that matches the energy levels, reduces the potential barriers between contacts
and increases the internal electric field strength. This configuration allows for efficient charge
separation and high photocurrent values. The results of the study serve as an important scientific basis
for designing a new generation of hybrid photovoltaic devices with high efficiency.