Novel Solvent-free Perovskite Deposition in Fabrication of Normal and Inverted Architectures of Perovskite Solar Cells

Abstract

We introduced a new approach to deposit perovskite layer with no need for dissolving perovskite precursors. Deposition of Solution-free perovskite (SFP) layer is a key method for deposition of perovskite layer on the hole or electron transport layers that are strongly sensitive to perovskite precursors. Using deposition of SFP layer in the perovskite solar cells would extend possibility of using many electron and hole transport materials in both normal and invert architectures of perovskite solar cells. In the present work, we synthesized crystalline perovskite powder followed by successful deposition on TiO2 and cuprous iodide as the non-sensitve and sensitive charge transport layers to PbI2 and CH3NH3I solution in DMF. The post compressing step enhanced the efficiency of the devices by increasing the interface area between perovskite and charge transport layers. The 9.07% and 7.71% cell efficiencies of the device prepared by SFP layer was achieved in respective normal (using TiO2 as a deposition substrate) and inverted structure (using CuI as deposition substrate) of perovskite solar cell. This method can be efficient in large-scale and low cost fabrication of new generation perovskite solar cells.

Excitation of Wet Perovskite Films by Ultrasonic Vibration Improves the Device Performance

“…Sci. 2018, 8,308 5 of 15 thickness data of the MAPbI3 perovskite layers deposited atop the m-TiO2 layer, as illustrated in Figure 4, which shows a decrease in the perovskite thickness with the vibration time. The enhanced infiltration of the m-TiO2 pores by the perovskite precursors leads to an increase in the contact surface between the perovskite and the TiO2 nanoparticles, within the m-TiO2 layer.…”

“…Therefore, the one-step method is easier to perform and is in line with the scale-up of the technology, and therefore adopted in this work. Regardless of the method of deposition, the perovskite crystallization process is usually controlled by cooling/heating and/or solvent engineering through the application of proper solvents and additives to manipulate the solubility limit and the solvent evaporation rate [8][9][10][11][12][13][14][15][16][17][18][19]. For improved device performance, many works employ additional interfacial layers, as well.…”

Progress in Scalable Coating and Roll‐to‐Roll Compatible Printing Processes of Perovskite Solar Cells toward Realization of Commercialization

“…(a),(b) Reproduced with permission . Copyright 2016, American Chemical Society; (c) Reproduced with permission . Copyright 2016, Nature Publishing Group; (d)–(g) Reproduced with permission .…”

“…This group also reported a novel solvent‐free perovskite film deposition method using spray and hot pressing processes, as shown in Figure c . Generally used solvents for the fabrication of PeSCs, such as DMF, could considerably influence some interfacial layers, such as CuI and Cu 2 O.…”

Development of Mixed‐Cation CsxRb1–xPbX3 Perovskite Quantum Dots and Their Full‐Color Film with High Stability and Wide Color Gamut

“…During or after synthesis, the wavelength can be easily tuned by anion exchange . These advantages allow the use of PeQDs in many applications, including solar cells, light‐emitting diodes (LEDs), and lasers …”