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Query: UMLS:C1849193 (
PSS
)
2,978
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:
PSS
) has been extensively used as the hole-transporting layer (HTL) in bulk heterojunction (BHJ) solar cells, however, its anisotropic electrical conduction and intrinsic acidic nature generally limit the device performance. Here we demonstrate the application of a water/alcohol soluble
CPE
(
CPE
-K) as HTLs in BHJ solar cells, achieving a PCE up to 8.2%. The more superior and uniform vertical electrical conductivity found in
CPE
-K reduces the series resistance and provides efficient hole extraction.
...
PMID:Conductive conjugated polyelectrolyte as hole-transporting layer for organic bulk heterojunction solar cells. 2417 May 87
The intrinsic acidic nature of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:
PSS
) hole-transporting layer (HTL) induces interfacial protonation and limits the device performance in organic solar cells based on basic pyridylthiadiazole units. By utilizing a pH neutral, water/alcohol soluble conjugated polyelectrolyte
CPE
-K as the HTL in p-DTS(PTTh2)2:PC71BM solar cells, a 60% enhancement in PCE has been obtained with an increased V(bi), reduced R(s), and improved charge extraction. These effects originate from the elimination of interfacial protonation and energy barrier compared with the PEDOT:
PSS
HTL.
...
PMID:Solution-processed pH-neutral conjugated polyelectrolyte improves interfacial contact in organic solar cells. 2549 25
The open-circuit voltage (
V
oc
) of perovskite photovoltaic diodes depends largely on the selection of charge transport layers (CTLs) and surface passivation, which makes it important to understand the physical processes occurring at the interface between the perovskite and a CTL. We provide a direct correlation between
V
oc
and the interfacial characteristics of perovskites tuned through stoichiometry engineering of precursor solutions and surface modification of the underlying poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:
PSS
) layer. Poor quality interfacial perovskite crystals were observed on top of the PEDOT:
PSS
layer, resulting in strong interfacial recombination and a low
V
oc
. In contrast, the growth of the interfacial perovskite crystals was significantly improved by the synergic effects of varying the precursor solution composition and covering the surface with a pH-neutral conjugated polyelectrolyte, poly[2,6-(4,4-bis(potassium butanylsulfonate)-4
H
-cyclopenta[2,1-
b
;3,4-
b
']dithiophene)-
alt
-4,7-(2,1,3-benzothiadiazole)] (
CPE
-K), which possesses potassium ions as counter ions. The influence of the energy-level alignment at the interface on
V
oc
was also discussed. Our findings highlight that improved perovskite crystallization at the interface can facilitate bulk growth of perovskite grains in the vertical direction and effectively suppress nonradiative surface charge recombination, thus enhancing the short-circuit current and
V
oc
.
...
PMID:Improved Interfacial Crystallization by Synergic Effects of Precursor Solution Stoichiometry and Conjugated Polyelectrolyte Interlayer for High Open-Circuit Voltage of Perovskite Photovoltaic Diodes. 3199 36
