Abstract
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has high optical transparency in the visible light range and low-temperature processing condition, making it one of the most widely used polymer hole transport materials inverted perovskite solar cells (PSCs), because of its high optical transparency in the visible light range and low-temperature processing condition. However, the stability of PSCs based on pristine PEDOT:PSS is far from satisfactory, which is ascribed to the acidic and hygroscopic nature of PEDOT:PSS, and property differences between PEDOT:PSS and perovskite materials, such as conductivity, work function and surface morphology. This review summaries recent efficient strategies to improve the stability of PEDOT:PSS in PSCs and discusses the underlying mechanisms. This review is expected to provide helpful insights for further increasing the stability of PSCs based on commercial PEDOT:PSS.
Highlights
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS, chemical structure is shown in Figure 1) is the most successful conducting polymer, which has been widely used in displays, transistors, various sensors and photovoltaics (PVs) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]
Many efforts have been made to the modification of the PEDOT:PSS layer for improving the long-term stability of perovskite solar cells (PSCs) [78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102]
Hytham et al reported a strategy to tune the acidic nature of PEDOT:PSS by adding urea, where the Power conversion efficiencies (PCE) was increased from 14.4% to 18.8% and the device can maintain 97% of its original PCE after 10-day in ambient air et et al demonstrated that doping metal different metal ammonium
Summary
Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS, chemical structure is shown in Figure 1) is the most successful conducting polymer, which has been widely used in displays, transistors, various sensors and photovoltaics (PVs) [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17] It can be dispersed in water as well as some organic solvents and conventional solution based coating methods can be used to fabricate high-quality PEDOT:PSS films [18,19]. For PSCs devices, HTL is usually indispensable for effectively blocking electrons and transporting holes It affects the quality of the upper perovskite layer which directly affects the efficiency and stability of the devices [69,70].
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