Porphyrin Supramolecule as Surface Carrier Modulator Imparts Hole Transporter with Enhanced Mobility for Perovskite Photovoltaics

• Published in: Angewandte Chemie International Edition Vol. 62; no. 39; pp. e202307152 - n/a
• Main Authors: Mu, Xijiao, Liu, Yajun, Xiao, Guo‐Bin, Xu, Chen, Gao, Xingbang, Cao, Jing
• Format: Journal Article
• Language: English
• Published: WEINHEIM Wiley 25.09.2023; Wiley Subscription Services, Inc
• Edition: International ed. in English
• Subjects: Charge transport; Chemistry; Chemistry, Multidisciplinary; Dimers; Hole mobility; Hole Transport Material; Mobility; Perovskite; Perovskites; Photovoltaic cells; Photovoltaics; Physical Sciences; Polarons; Porphyrin; Porphyrins; Science & Technology; Solar Cells; Surface Carrier Modulator; Surface charge; Transport phenomena; Perovskite; DESIGN; STATES; SOLAR-CELLS; LOW-COST; Porphyrin; EPR; Surface Carrier Modulator; Solar Cells; EFFICIENT; Hole Transport Material
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.202307152

Modulating the surface charge transport behavior of hole transport materials (HTMs) would be as an potential approach to improve their hole mobility, while yet realized for fabricating efficient photovoltaic devices. Here, an oxygen bridged dimer‐based monoamine FeIII porphyrin supramolecule is prepared and doped in HTM film. Theoretical analyses reveal that the polaron distributed on dimer can be coupled with the parallel arranged polarons on adjacent dimers. This polaron coupling at the interface of supramolecule and HTM can resonates with hole flux to increase hole transport efficiency. Mobility tests reveal that the hole mobility of doped HTM film is improved by 8‐fold. Doped perovskite device exhibits an increased efficiency from 19.8 % to 23.2 %, and greatly improved stability. This work provides a new strategy to improve the mobility of HTMs by surface carrier modulation, therefore fabricating efficient photovoltaic devices. Modulating the charge‐transport behavior of hole‐transport materials (HTMs) is a path toward improved hole mobility and enhanced device properties when used in solar cells. Here, we design a porphyrin supramolecule to modulate the surface properties of the commonly used Spiro‐OMeTAD HTM in perovskite solar cells. Upon doping monoamine FeIII porphyrin into Spiro‐OMeTAD, the porphyrins self‐assemble into oxygen‐bridged dimer‐based supramolecules located at the grain boundaries of the HTM. The doped perovskite devices exhibit an increased efficiency from 19.8 % to 23.2 %, and greatly improved stability.