MRS Meetings and Events


EN05.10.26 2023 MRS Fall Meeting

Double Punch for Suppressing Phase Segregation: Interface Engineering with Synergistic Passivation and Efficient Hole Extraction

When and Where

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

Hynes, Level 1, Hall A



Zhaojie Zhang1,Julia Martin2,Ronald Grimm2,Dhandapani Venkataraman1

University of Massachusetts--Amherst1,Worcester Polytechnic Institute2


Zhaojie Zhang1,Julia Martin2,Ronald Grimm2,Dhandapani Venkataraman1

University of Massachusetts--Amherst1,Worcester Polytechnic Institute2
In p-i-n perovskite solar cells (PSCs), the buried hole transport layer (HTL)/perovskite interface plays a vital role in dictating the performance and stability of the full photovoltaic device. However, the impact of HTLs on vertical phase segregation remains unknown. This work systematically explores the impact of electronic and chemical properties of HTLs on vertical halide segregation of mixed-halide perovskite materials. Here, we demonstrate that PTAA/CuI<sub>x</sub>Br<sub>1-x</sub> bilayer HTL significantly suppresses light-induced vertical phase segregation of MAPb(I<sub>0.7</sub>Br<sub>0.3</sub>)<sub>3</sub>. We used grazing-incidence X-ray diffraction (GI-XRD) to capture the depth-resolved composition change of MAPb(I<sub>0.7</sub>Br<sub>0.3</sub>)<sub>3</sub> at the interface and bulk with different HTLs under illumination. Electronic properties including hole density, hole mobility, and energy levels of CuI<sub>x</sub>Br<sub>1-x</sub> were systematically characterized to reveal the impact of HTL on phase segregation. By manipulating the illumination and electronic properties of HTL, we illustrate the interplay between illumination direction, interfacial defects, charge carrier extraction, and vertical phase segregation. Our findings demonstrate that the PTAA/CuI<sub>x</sub>Br<sub>1-x</sub> bilayer, with its synergistic passivation and efficient hole extraction ability, stabilizes the interface and bulk of the mixed halide perovskite layer, preventing phase segregation and possible amorphization. This work highlights that synergetic passivation and efficient hole extraction pack a more powerful punch for suppressing the vertical phase segregation in mixed-halide perovskite.


interface | perovskites

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