Open AccessCut from the Same Cloth: Enamine-Derived Spirobifluorenes as Hole Transporters for Perovskite Solar Cells
Author(s) -
Deimantė Vaitukaitytė,
Cristina Momblona,
Kasparas Rakštys,
Albertus Adrian Sutanto,
Bin Ding,
Cansu Igci,
Vygintas Jankauskas,
Alytis Gruodis,
Tadas Malinauskas,
Abdullah M. Asiri,
Paul J. Dyson,
Vytautas Getautis,
Mohammad Khaja Nazeeruddin
Publication year - 2021
Publication title -
chemistry of materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.741
H-Index - 375
eISSN - 1520-5002
pISSN - 0897-4756
DOI - 10.1021/acs.chemmater.1c01486
Subject(s) - enamine , energy conversion efficiency , perovskite (structure) , materials science , fabrication , chemical engineering , catalysis , inert , nanotechnology , optoelectronics , chemistry , organic chemistry , medicine , alternative medicine , pathology , engineering
To attain commercial viability, perovskite solar cells (PSCs) have to be reasonably priced, highly efficient, and stable for a long period of time. Although a new record of a certified power conversion efficiency (PCE) value over 25% was achieved, PSC performance is limited by the lack of hole-transporting materials (HTMs), which extract positive charges from the light-absorbing perovskite layer and carry them to the electrode. Here, we report spirobifluorene-based HTMs with finely tuned energy levels, high glass-transition temperature, and excellent charge mobility and conductivity enabled by molecularly engineered enamine arms. HTMs are synthesized using simple condensation chemistry, which does not require costly catalysts, inert reaction conditions, and time-consuming product purification procedures. Enamine-derived HTMs allow the fabrication of PSCs reaching a maximum PCE of 19.2% and stability comparable to spiro-OMeTAD. This work demonstrates that simple enamine condensation reactions could be used as a universal path to obtain HTMs for highly efficient and stable PSCs.