Solubility of Hybrid Halide Perovskites in DMF and DMSO.

Andrey A Petrov,Sergey A Fateev,Eugene A Goodilin,Alexey B Tarasov,Artem A Ordinartsev

doi:10.3390/molecules26247541

Andrey A Petrov, Sergey A Fateev + Show 3 more

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https://doi.org/10.3390/molecules26247541

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Abstract

Solution methods remain the most popular means for the fabrication of hybrid halide perovskites. However, the solubility of hybrid perovskites has not yet been quantitively investigated. In this study, we present accurate solubility data for MAPbI3, FAPbI3, MAPbBr3 and FAPbBr3 in the two most widely used solvents, DMF and DMSO, and demonstrate huge differences in the solubility behavior depending on the solution compositions. By analyzing the donor numbers of the solvents and halide anions, we rationalize the differences in the solubility behavior of hybrid perovskites with various compositions, in order to take a step forward in the search for better processing conditions of hybrid perovskites for solar cells and optoelectronics.

Highlights

Hybrid lead–halide perovskites with a general formula APbX3 (A = CH3NH3+, CH(NH2)2+; X = I−, Br−, Cl−) represent a new perspective class of materials for solar cells and optoelectronics as they possess a set of outstanding properties such as high absorption coefficients, high charge carrier mobility and intense luminescence [1,2,3]
We found that the solubilities of iodide perovskites, MAPbI3 and FAPbI3, in DMF steadily increase upon heating from 30 ◦C to 90 ◦C, demonstrating direct solubility behavior (Figure 1a)
The solubility for MAPbI3 and FAPbI3 in DMF and the solubility of MAPbI3, FAPbI3, MAPbBr3 and FAPbBr3 in dimethyl sulfoxide (DMSO) are presented for the first time

Summary

Introduction

Hybrid lead–halide perovskites with a general formula APbX3 (A = CH3NH3+, CH(NH2)2+; X = I−, Br−, Cl−) represent a new perspective class of materials for solar cells and optoelectronics as they possess a set of outstanding properties such as high absorption coefficients, high charge carrier mobility and intense luminescence [1,2,3]. Because of their high solubility in polar coordinating solvents, hybrid perovskites can be obtained using simple and cheap solutions methods such as spin-coating, slot-die coating, blade-coating, etc. Another consequence of the absence of reliable solubility data of perovskites in DMF, DMSO or mixed solvents is neglecting the fact that solutions used for perovskite processing prepared at elevated temperatures are, often oversaturated when deposited, which leads to reduced reproducibility and weak morphology control when processing light-absorbing layers [8]

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