Porphyrin‐Based Simple and Practical Dopant‐Free Hole‐Transporting Materials for Efficient Perovskite Solar Cells Using TiO₂ Semiconductors

Abstract

A new series of structurally simple and easily accessible hole‐transporting materials (HTMs) YZT1–YZT4 using porphyrin backbone is devised for high‐performance perovskite solar cells (PSCs) with and without the aid of doping. The YZT‐series HTMs have either push–push or push–pull type planar linear molecular geometry with substitution of linear or branched alkylamine. UV–vis absorption, photoluminance (PL) quenching experiments, and theoretical studies all suggest a different pattern of molecular packing induced by molecular geometry and/or substituted chains. Nonetheless, both types of porphyrin HTMs perform well in TiO2‐based PSCs when doped YZT4 with a power conversion efficiency (PCE) of 14.95% and undoped YZT1 with a PCE of 13.10%. The results clearly reveal the potential for porphyrin‐based HTMs for use in dopant‐free PSCs.

Advances and prospects of porphyrin derivatives in the energy field

“…8e) with simpler structures and easier preparation. 52 However, the PCE of batteries device used YZT-series as HTMs doped with tBP and FK209 is much lower than spiro-OMeTAD under the same condition (Table 3).…”

Phthalocyanines, porphyrins and other porphyrinoids as components of perovskite solar cells

“…Stability studies were carried out without dopants under the dark with RH 40% and showed that YZT4 retain 85% of the initial PCE after 340 h which is much better than that of spiro-OMeTAD. 87…”

Simple Yet Efficient: Arylamine‐Terminated Carbazole Donors for Organic Hole Transporting Materials

“…Efforts have been devoted to designing and fabricating HTMs from organic building blocks, [ 5,6 ] including organic small molecules, [ 7–36 ] polymers, [ 37,38 ] and organometallic compounds. [ 39–41 ] Among them small organic HTMs have received tremendous attentions due to their high performance, structural variety, and easy fabrication.…”