MRS Meetings and Events


EN05.10.16 2023 MRS Fall Meeting

Additive Engineering in 2-Methoxyethaol Based Perovskite Film Formation for Perovskite Solar Cells

When and Where

Nov 29, 2023
8:00pm - 10:00pm

Hynes, Level 1, Hall A



Sung Hun Lee1,Hyo Jung Kim1

Pusan National University1


Sung Hun Lee1,Hyo Jung Kim1

Pusan National University1
Perovskite solar cells (PSCs) have attracted significant attention because of their unique characteristics such as low-cost fabrication through solution processes and excellent photoelectric properties. Solution-processed perovskite films using polar aprotic solvent such as dimethyl sulfoxide (DMSO) generally required auxiliary process like anti-solvent drop. However, the anti-solvent dripping process has strict process window to form a uniform film such as dripping duration, volume, and pressure of the anti-solvent.<br/>Recently, solvent engineering using 2-methoxyethanol (2MOE), which has selective solubility that dissolves methylammonium iodide (MAI) but not PbI<sub>2</sub> alone, have been studied for perovskite film formation for an anti-solvent free process. Although perovskite phase film could be obtained on the 2MOE solvent system without the anti-solvent process, the film generally has many pinholes leading to low power conversion efficiency (PCE) in PSCs. This problem is caused by low coordination with the precursor and high volatile of 2MOE.<br/>To overcome this issue, we applied several additives, which affect to the kinetics of crystallization, in the 2MOE-based anti-solvent free process. First, we used various co-solvents, such as dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP), that can induce intermediate phases in which highly coordinated system with the precursors and solvents (MAI-PbI<sub>2</sub>-DMSO and MAI-PbI<sub>2</sub>-NMP). The formation of intermediate phases retarders crystal growth of perovskite and leads to high crystallinity of the perovskite. Through this, we found that NMP is a suitable additive for pinhole free perovskite film. We obtained an efficiency of 20.39% with the maximum efficiency for the device based on the MAPbI<sub>3-x</sub>Cl<sub>x</sub> film fabricated with a 2MOE-based solution containing NMP.<br/>Second, we compared film formation by adding alkyl amines with different chain lengths in 2MOE single solvent system. Through this, we found that the uniform and dense film could be obtained by adding small molecule of oleyamine (OAm) having long 18-carbon chain without anti-solvent dripping. In that study, we measured real-time grazing incidence wide angle X-ray scattering (GIWAXS) in spin cast process to study how the added alkylamine affected to film quality. We found that the longer alkyl chain of alkyl amines induced the faster nucleation and fast crystal growth of perovskite in film formation. We fabricated inverted PCSs using the high-quality film containing OAm as a light absorption layer and obtained PCE of 21.01%.


nucleation & growth | perovskites | x-ray diffraction (XRD)

Symposium Organizers

Marina Leite, University of California, Davis
Lina Quan, Virginia Institute of Technology
Samuel Stranks, University of Cambridge
Ni Zhao, Chinese University of Hong Kong

Symposium Support

Enli Technology Co., LTD

APL Energy | AIP Publishing

Session Chairs

So Min Park
Lina Quan

In this Session

Interstitial Defect Relaxation DFT Study of Lead Halide Perovskites

Water-Assisted Morphology and Crystal Engineering of Hybrid Organic-Inorganic Halide Perovskite: Implications for Optoelectronic Properties

Self-Leveling Inks for Engineering Large Area Uniformity in High-Performance Flexography-Printed Perovskite Solar Cells

Towards Highly Efficient Fully Evaporated Perovskite/Si Tandem Solar Cells

The Outstanding Role of Dielectricity in Hybrid Solar Cell Absorbers

Controlling The Crystallization of Pure Bromide Quasi-2-Dimensional Perovskite Crystals for High Efficiency Pure-Blue Light-Emitting Diodes

Compositional Engineering of Single-Crystal Perovskite for Highly Efficient Photovoltaics

Atomistic Origin of Transparent Absorption Spectra of Halide Perovskites

Exploring a Novel Family of Conjugated Polymers for High Efficiency and Thermally Stable Perovskite Solar Cells

Charge Transfer Doping of Ruddlesden–Popper Metal–Halide Perovskites via Bulk Incorporation of Organic Molecular Dopants

View More »

Publishing Alliance

MRS publishes with Springer Nature