Non-Fullerene Semiconductors for Applications in Emerging Photovoltaics
Lauryna Monika Svirskaite a, Tadas Malinauskas a, Vytautas Getautis a
a Department of Organic Chemistry, Kaunas University of Technology, Kaunas LT-50254, Lithuania.
Poster, Lauryna Monika Svirskaite, 070
Publication date: 24th October 2023

Development of new charge transporting materials used for solar cells construction is necessary to reach high performances. So far, new p-type semiconductor self-assembled molecules (SAMs) are being rapidly investigated [1], the effort devoted towards designing new n-type semiconductors is significantly less noticeable. This comes due to relative scarcity of suitable and available acceptors, used for non-fullerene ETMs synthesis [2]. The field of n-type semiconductors is dominated by C60 and its functionalized derivatives (e.g., PC61BM, PC71BM) in various structure of solar cells [3-5]. Nevertheless, difficult synthesis and purification, significant product cost of modified compounds (especially C70 derivatives) and a low solubility of non-modified fullerenes in organic solvents hinders their applicability in devices [3]. Moreover, fullerenes have limited variation of energy levels alignment, photochemical and thermal instability and relatively weak intermolecular interactions in the solid state, which is also important parameters for high performance solar cell [3-5].

In this work new n-type semiconductors containing naphthalene diimide, naphthalimides, fluorene and fluorenone central fragment along with various anchoring groups were synthesized and investigated for possible application in various structure of solar cell. These semiconductors demonstrated good thermal stability and suitable electrochemical properties for effective electron transport from absorber layer to cathode. SAMs have shown changed substrate contact angle, which indicates bond formation between monolayer forming compounds and perovskite, ITO, TiO2, Sb2S3, or Sb2Se3 surface.

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