posted on 2022-07-14, 17:10authored byHailiang Liu, Sajjad Hussain, Zeesham Abbas, Jehoon Lee, Syed Hassan Abbas Jaffery, Jongwan Jung, Hyun-Seok Kim, Dhanasekaran Vikraman, Jungwon Kang
The interface design of inorganic and organic halide
perovskite-based
devices plays an important role to attain high performance. The modification
of transport layers (ETL and HTL) or the perovskite layer is given
the crucial inspiration to realize superior power conversion efficiencies
(PCEs). The highly conducting 2D materials of CNT, graphene/GO, and
transition-metal dichalcogenides (TMDs) are suitable substitutes to
tune the electronic structure/work function of perovskite devices.
Herein, the nanocomposites composed of molybdenum dichalcogenides
(MoX2 = MoS2, MoSe2, and MoTe2) stretched CNT was embedded with HTL or perovskite layer
to improve the resulted characteristics of perovskite devices of solar
cells and X-ray detectors. A superior solar cell efficiency of 12.57%
was realized for the MoTe2@CNT nanocomposites using a modified
active layer-composed device. Additionally, X-ray detectors with MoTe2@CNT-modulated active layers achieved 13.32 μA/cm2, 3.99 mA/Gy·cm2, 4.81 × 10–4 cm2/V·s, and 2.13 × 1015 cm2/V·s of CCD-DCD, sensitivity, mobility, and trap density,
respectively. Density functional theory approximation was used to
realize the improved electronics properties, optical properties, and
energy band structures in the MoX2@CNT-doped perovskites
evidently. Thus, the current research paves the way for the improvement
of highly efficient semiconductor devices based on perovskite-based
structures with the use of 2D nanocomposites.