Large Grain-Based Hole-Blocking Layer-Free Planar-Type Perovskite Solar Cell with Best Efficiency of 18.20%

Abstract

There remains tremendous interest in perovskite solar cells (PSCs) in the solar energy field; the certified power conversion efficiency (PCE) now exceeds 20%. Along with research focused on enhancing PCE, studies are also underway concerning PSC commercialization. It is crucial to simplify the fabrication process and reduce the production cost to facilitate commercialization. Herein, we successfully fabricated highly efficient hole-blocking layer (HBL)-free PSCs through vigorously interrupting penetration of hole-transport material (HTM) into fluorine-doped tin oxide by a large grain based-CHNHPbI (MAPbI) film, thereby obtaining a PCE of 18.20%. Our results advance the commercialization of PSCs via a simple fabrication system and a low-cost approach in respect of mass production and recyclability.

Simple, Robust, and Going More Efficient: Recent Advance on Electron Transport Layer‐Free Perovskite Solar Cells

“…While for ETL-free device, ETL is absent and the contribution of ETL to J-V hysteresis no longer exists. [93] While, for the mesoscopic PSC without ETL as reported by Han and co-workers, there were almost no substantial hysteresis effects observed as a very small hysteresis index of 0.014 was calculated, which is in accordance with the photoresponse behavior of the mesoscopic PSC with ETL ( Figure 18b). From Figure 18, the device structure, scanning rate, interface modification layer, and HTL specifically adopted all have effect on the hysteresis behavior.…”

“…As the cost of FTO electrodes make up a large portion of the material cost of PSCs, recycling them can also reduce the fabrication cost. [93] They found that the performance of TiO 2 based device was dramatically decreased after only one cycle, which was ascribed to the existence of residual PbI 2 on the TiO 2 surface, whereas the ETL-free device performance was equally maintained with that of the initial cell after four cycles (Figure 19f-h). [93] They found that the performance of TiO 2 based device was dramatically decreased after only one cycle, which was ascribed to the existence of residual PbI 2 on the TiO 2 surface, whereas the ETL-free device performance was equally maintained with that of the initial cell after four cycles (Figure 19f-h).…”

“…While for ETL-free device, the case is much different. [93] These MAPbI 3 films with large grain can hinder HTL permeation effectively, enabling a reduction in carrier recombination. Figure 14b,c gives the dependence of the V oc of the ETL-free device on perovskite coverage derived from numerical simulation, which implies a severe influence of perovskite coverage on the performance of the ETL-free device.…”

“…[73] In the work by Ke et al, the PCE of the nonencapsulated ETL-free PSC was about 70% of its initial value after 500 h of storage in atmosphere with 20% humidity and at room temperature under dark ( Figure S5b, Supporting Information). [93] The insertion of interfacial layer can also improve the stability of the device ( Figure S5e-g, Supporting Information). [94] Yu et al found that the ETL-free PSCs had strong durability from attack by sunlight or moisture compared with device with TiO 2 inserted as a TiO 2 layer mainly destroys MAPbI 3 at the interface by an UV light-induced trap-charge driven photocatalytic degradation effect ( Figure S5d, Supporting Information).…”

“…Energy Mater. [93] Copyright 2017, ACS Publications. a) Schematic illustration and b) preparation process to fabricate ETL-free PSCs by recycling the FTO/glass substrates derived from the degraded devices.…”