Organic–inorganic
hybrid perovskite solar cells (PSCs) has
achieved the power conversion efficiency (PCE) of 25.2% in the last
10 years, and the PCE of inverted PSCs has reached >22%. The rapid
enhancement has partly benefited from the employment of suitable hole
transport layers. Especially, poly(3,4-ethenedioxythiophene):poly(styrenesulfonate)
(PEDOT:PSS) is one of the most widely used polymer hole transport
materials in inverted PSCs, because of its high optical transparency
in the visible region and low-temperature processing condition. However,
the PCE and stability of PSCs based on pristine PEDOT:PSS are far
from satisfactory, which are ascribed to low fitness between PEDOT:PSS
and perovskite materials, in terms of work function, conductivity,
film growth, and hydrophobicity. This paper summaries recent progress
regarding to modifying/remedy the drawbacks of PEDOT:PSS to improve
the PCE and stability. The systematically understanding of the mechanism
of modified PEDOT:PSS and various characteristic methods are summarized
here. This Review has the potential to guide the development of PSCs
based on commercial PEDOT:PSS.
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