2D-MoS₂ nanosheets as effective hole transport materials for colloidal PbS quantum dot solar cells

Abstract

Herein, we demonstrate for the first time matrix-free deposition of two dimensional (2D) MoS2 nanosheets as an efficient hole transport layer (HTL) for colloidal lead sulfide (PbS) quantum dot (QD) solar cells.

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

“…The charge transport measurements, such as current–voltage curves under light illumination and external quantum efficiency (EQE) as a function of wavelength for both without and with MoS 2 hole transporting layers, are shown in Figure c,d. Device performance was improved with the insertion of the hole transport layer, the PCE increased from 0.92% to 2.48% . The MoS 2 :ZnO composites prepared by sol–gel processing were used as the electron transport layer in polymer solar cells based on poly [bis (5‐(2‐ethyl hexyl) thien‐2‐yl) benzo di thiophene–alt–(4‐(2‐ethyl hexyl)‐3‐fluoro thieno thiophene)‐2‐carboxylate‐2,6‐diyl)] (PTB7‐TH): phenyl‐ C71‐ butryric acid methyl ester (PC71BM) in various ratios.…”

Delayed Charge Recombination by Open‐Shell Organics: Its Application in Achieving Superb Photodetectors with Broadband (400–1160 nm) Ultrahigh Sensitivity and Stability

“…[ 1 ] Advances in this area following the emergence of atomically thin 2D materials, such as graphene, MoS 2 and other types of transition‐metal dichalcogenides (TMDs), have offered promising routes to enhance functionality in photodetection. [ 2–11 ] This functionality mainly lies in their unique electronic and optical properties arising from the monolayer van der Waals heterostructure. [ 2–11 ] Among the various 2D materials that have been employed in ultrathin optoelectronic devices, MoS 2 has been highlighted because of extremely high stability, a direct bandgap, [ 9,12 ] reliable scalable synthesis, [ 10 ] excellent optoelectronic performances [ 9,12 ] and capability for heterogeneous integration.…”

“…[ 2–11 ] This functionality mainly lies in their unique electronic and optical properties arising from the monolayer van der Waals heterostructure. [ 2–11 ] Among the various 2D materials that have been employed in ultrathin optoelectronic devices, MoS 2 has been highlighted because of extremely high stability, a direct bandgap, [ 9,12 ] reliable scalable synthesis, [ 10 ] excellent optoelectronic performances [ 9,12 ] and capability for heterogeneous integration. [ 13–15 ] For example, MoS 2 ‐based PDs derived from single‐ and/or multilayer MoS 2 have been reported to respond to ultraviolet (UV) and visible light illumination, rendering photoresponsivities up to 880 A W −1 (monolayer) 7 and ≈0.6 A W −1 (few layers), [ 12 ] despite a relatively small bandgap (1.2 eV for MoS 2 ).…”

Role of graphene and transition metal dichalcogenides as hole transport layer and counter electrode in solar cells

“…By applying mechanical stress and alloy formation such as Mo 1− x W x S 2 the band gap, electron affinity, and ionization potential of TMDCs can be tailored. Furthermore, the charge recombination and charge diffusion length can be reduced by using nanostructure materials that ultimately enhance the PCE of the SC …”

“…Furthermore, the charge recombination and charge diffusion length can be reduced by using nanostructure materials that ultimately enhance the PCE of the SC. 45 Therefore, the highly conductive, transparent, and flexible material like graphene is a worthwhile candidate as counter electrode and charge transport layer for improvement in the performance of SCs. Moreover, ultrathin TMDCs with good optical performance and strong light-matter interaction are promising candidate for organic, dye sensitize, and perovskite SCs.…”