Functionalized BODIPYs as Tailor‐Made and Universal Interlayers for Efficient and Stable Organic and Perovskite Solar Cells

Abstract

Solar cells based on metal halide perovskite and polymer donor:nonfullerene acceptor blend absorbers have recently witnessed a significant rise in their photovoltaic performance. However, they still suffer from some instability issues originating from the inferior interface quality and poor nanomorphology of the absorber layer. In this work, a series of functionalized boron‐dipyrromethene, BODIPY, molecules are introduced as ultrathin interlayers at the absorber/electron transport layer interface. This study indicates that BODIPY compounds with a high molecular dipole moment can enhance the device performance mainly due to better interface energy level alignment. They also induce passivation of defect traps and improvement in the charge transport properties of the absorber layer coated on top of them. Among the various compounds used, amino‐functionalized BODIPY, owing to the synergetic effect of the abovementioned factors, enables the highest power conversion efficiency in organic (15.69%) as well as in perovskite solar cells (20.12%). Amino‐functionalized BODIPY also demonstrates an enhanced stability under continuous illumination (in nitrogen) without and with heating (at 65 °C) for 1000 h. These results pave the way for the implementation of molecules with tailor‐made functionalities in high efficiency and stable solution‐based photovoltaic devices of the future.

Improved Thermal and Electrical Properties of P-I-N-Structured Perovskite Solar Cells Using ZnO-Added PCBM as Electron Transport Layer

“…Since ETL and HTL have very low thermal conductivity, it is difficult to dissipate the heat generated from the solar cell. Although PVSK solar cells with improved stability using 2D PVSK and interfacial engineering have been reported [ 22 , 23 , 24 , 25 ], normally, perovskite materials have poor thermal stability, so it is necessary to improve heat dissipation performance by improving heat transfer in the ETL and HTL surrounding the light absorption layer. In addition, in order to apply solar cells to various applications, such as energy sources for human body-attachable medical devices and smart electronic devices, it is important to quickly remove internal heat through the heat dissipation design of the device.…”

Unveiling the Role of BODIPY Dyes as Small‐Molecule Hole Transport Material in Inverted Planar Perovskite Solar Cells

“…[ 21–24 ] Additionally, the integration of arylamines into BODIPY derivatives not only amplifies these intrinsic properties but also exploits the strong electron‐donating capacity of arylamines, thereby improving the charge transport properties essential for efficient HTMs. Although the BODIPY core has been employed in the design of small molecule‐based HTMs, dopant‐free polymeric HTMs, and tailor‐made interlayers, resulting in high power conversion efficiency (PCEs), [ 25–29 ] research on BODIPY‐based HTMs remains limited, with just a few studies documenting their use. [ 25–27 ]…”

“…[21][22][23][24] Additionally, the integration of arylamines into BODIPY derivatives not only amplifies these intrinsic properties but also exploits the strong electron-donating capacity of arylamines, thereby improving the charge transport properties essential for efficient HTMs. Although the BODIPY core has been employed in the design of small moleculebased HTMs, dopant-free polymeric HTMs, and tailor-made interlayers, resulting in high power conversion efficiency (PCEs), [25][26][27][28][29] research on BODIPY-based HTMs remains limited, with just a few studies documenting their use. [25][26][27] This study introduces five novel small molecule BODIPY dyes (PyBDP 1-5) with extended conjugation at the α-positions, by integrating arylamine donors such as triphenylamine, carbazole, and phenothiazine, designed to enhance the optoelectronic properties and stability required for effective HTMs.…”

Photoelectrochemical Properties of BODIPY-Sensitized Anodic TiO2 Layers Decorated with AuNPs for Enhanced Solar Performance

“…BODIPY dyes are a very attractive group of compounds with useful fluorescent labels for biomolecules, and their new derivatives have found applications as chemosensors, light absorbers, logic gates, theranostic agents for photodynamic therapy, and photoinitiators for cationic photopolymerization for 3D printing. , One of the advantages of BODIPY dye sensitization for energy-related applications − (DSSC or photocatalytic) compared to commercial N719 is a metal-free structure, which makes it more cost-effective and environmentally friendly . What is more, the B–N bond offers good dye stability in different solvents …”