The complete in-gap electronic structure of colloidal quantum dot solids and its correlation with electronic transport and photovoltaic performance.
The direct observation of the complete electronic band structure of a family of PbS CQD solids via photoelectron spectroscopy is reported. We investigate how materials processing strategies, such as the latest passivation methods that produce record-performance photovoltaics, achieve their performance advances. Halide passivated films show a drastic reduction in states in the midgap, contributing to a marked improvement in the device performance.
Division of Physical Sciences and Engineering, Solar and Photovoltaic Engineering Center, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Khabiboulakh
K
Katsiev
Alexander H
AH
Ip
Armin
A
Fischer
Iori
I
Tanabe
Xin
X
Zhang
Ahmad R
AR
Kirmani
Oleksandr
O
Voznyy
Lisa R
LR
Rollny
Kang Wei
KW
Chou
Susanna M
SM
Thon
Graham H
GH
Carey
Xiaoyu
X
Cui
Aram
A
Amassian
Peter
P
Dowben
Edward H
EH
Sargent
Osman M
OM
Bakr
electronic structure; photoelectron spectroscopy; photovoltaics; quantum dots; trap states