Photophysical Study of Polymer-Based Solar Cells with an Organo-Boron Molecule in the Active Layer

Abstract

Our group previously reported the synthesis of four polythiophene derivatives (P1–P4) used for solar cells. The cells were prepared under room conditions by spin coating, leading to low efficiencies. However, after the addition of 6-nitro-3-(E)-3-(4-dimethylaminophenyl)allylidene)-2,3-dihydrobenzo[d]-[1,3,2] oxazaborole (M1) to their active layers, the efficiencies of the cells showed approximately a two-fold improvement. In this paper, we study this enhancement mechanism by performing ultrafast transient absorption (TA) experiments on the active layer of the different cells. Our samples consisted of thin films of a mixture of PC61BM with the polythiophenes derivatives P1–P4. We prepared two versions of each sample, one including the molecule M1 and another without it. The TA data suggests that the efficiency improvement after addition of M1 is due not only to an extended absorption spectrum towards the infrared region causing a larger population of excitons but also to the possible creation of additional channels for transport of excitons and/or electrons to the PC61BM interface.

Highly dendritic polythiophene/silver (PT/Ag) nanocomposite for solar energy applications

“…Polythiophene (PT) is considered as one of the most broadly used donor materials for polymer solar cells (PSCs) [37][38][39]. Intensive research work has been done to enhance the photo absorbtion property of PT by incorporation of electron donating and accepting moieties into PT matrix [40][41][42]. The electron-donating capacity and the morphological structure are the key factors controlling the energy levels, and photovoltaic performance of PTs.…”

Organoboron Schiff bases as cell‐staining fluorescent probes: Synthesis, Chemio‐photophysical characterization, DFT, and X‐ray structures

“…Nowadays, the Boron dipyrromethanes (BODIPYs) are the most widely fluorescence organic compounds studied due to the vast range of biochemical and medical applications and probably in the second place the Boron diketonates (BODIKEs) where both show selective cytoplasm staining in vitro (Figure a) . However, in the last decade, the Boron Schiff bases (BOSCHIBAs, Figure a) have gained attention due to easy and green synthesis, non‐linear optical and linear optical properties, sensitive for solar cells . However, the fluorescent Boron derivatives from Schiff bases are sparse in fluorescent probes ( vide infra ) .…”

Triarylboron Anchored Luminescent Probes: Selective Detection and Imaging of Thiophenols in the Intracellular Environment

“…In recent times, boron compounds have attracted a lot of attention owing to their potential applications in light emitting diodes and displays, solar cells and energy harvesting systems, nonlinear optical materials, and cell imaging. − Among various boron compounds, triarylborane (TAB) based compounds holds a special position, in view of their numerous applications in materials and biology. − Due to their bright and tunable luminescence features, TAB compounds are widely exploited as sensors and external stimuli responsive materials. − However, boron based sensors have not been explored exclusively for the detection of thiols. , …”