Self-assembled monolayers as hole-transporting materials for inverted perovskite solar cells

Abstract

On the basis of the anchoring group, three categories of self-assembled monolayer hole-transporting materials in high-performance inverted perovskite solar cells are discussed.

Phosphonic acid anchored tripodal molecular films on indium tin oxide

“…34 Therefore, PA SAMs are frequently used for interfacial engineering of oxide substrates, 34–40 above all in the context of organic electronics and photovoltaics. 34,35,39,41,42 To this end, in the present study, we tested the monomolecular assembly of PA-decorated triptycene (TripPA, Fig. 1) on a model oxide substrate – indium tin oxide (ITO).…”

“…This transparent and conductive support is not only a suitable test system but is of importance on its own, in view of its broad applications as an electrode material in organic transistors, organic light emitting devices, and organic and perovskite solar cells. 34,35,39,41,42 As a direct reference to the tripodal TripPA molecule, we used monopodal benzylphosphonic acid (PPA, Fig. 1), corresponding to the individual ‘blade’ of TripPA.…”

Fluorene- and fluorenone-based molecules as electron-transporting SAMs for photovoltaic devices

“…16 This innovation had a signicant impact on the improvement of p-i-n perovskite solar cells and at the same time further accelerated development of self-assembled (SAM) hole-transporting materials. 17 However, the efficiency of the solar cells is also strongly dependent on the type of semiconductor selected as electron-transporting material (ETM). 18 Furthermore, the choice of ETMs is signicantly more limited compared with hole-transporting analogues.…”

Structural divergence of molecular hole selective materials for viable p-i-n perovskite photovoltaics: a comprehensive review

“…85,112,113 Eminent research groups reviewed the development and prospects of organic HSMs for p-i-n PSCs in recent years. 84,112–121 As most of the organic HSMs incorporated phenylamine derivatives as donor units, understanding the influence of the different types of central core structural units in determining photovoltaic and stability performance will provide important information for selecting core units in future HSM molecular design for p-i-n PSCs. However, so far, comprehensive analyses of these central core units for p-i-n PSCs are limited in the literature.…”