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Query: EC:6.2.1.1 (
ACS
)
78,556
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
To improve the constraints of kesterite Cu
2
ZnSnS
4
(CZTS) solar cell, such as undesirable band alignment at p-n interfaces, bandgap tuning, and fast carrier recombination, cadmium (Cd) is introduced into CZTS nanocrystals forming Cu
2
Zn
1-
x
Cd
x
SnS
4
through cost-effective solution-based method without postannealing or sulfurization treatments. A synergetic experimental-theoretical approach was employed to characterize and assess the optoelectronic properties of Cu
2
Zn
1-
x
Cd
x
SnS
4
materials. Tunable direct band gap energy ranging from 1.51 to 1.03 eV with high absorption coefficient was demonstrated for the Cu
2
Zn
1-
x
Cd
x
SnS
4
nanocrystals with changing Zn/Cd ratio. Such bandgap engineering in Cu
2
Zn
1-
x
Cd
x
SnS
4
helps in effective carrier separation at interface. Ultrafast spectroscopy reveals a longer lifetime and efficient separation of photoexcited charge carriers in Cu
2
CdSnS
4
(
CCTS
) nanocrystals compared to that of CZTS. We found that there exists a type-II staggered band alignment at the CZTS (
CCTS
)/CdS interface, from cyclic voltammetric (CV) measurements, corroborated by first-principles density functional theory (DFT) calculations, predicting smaller conduction band offset (CBO) at the
CCTS
/CdS interface as compared to the CZTS/CdS interface. These results point toward efficient separation of photoexcited carriers across the p-n junction in the ultrafast time scale and highlight a route to improve device performances.
ACS
Appl Energy Mater 2020 Jun 22
PMID:Experimental and Theoretical Study into Interface Structure and Band Alignment of the Cu
2
Zn
1-
x
Cd
x
SnS
4
Heterointerface for Photovoltaic Applications. 3290 59
