Publication

Suppressing Sn-Rich Phase Precipitation Enables Controlled Crystallization in MA-free Sn–Pb Perovskite Solar Cells

2026

Abstract

Methylammonium-free (MA-free) tin–lead perovskites are essential for durable all-perovskite tandem solar cells (APTSCs), yet the lower activation energy of Sn-based phases triggers a premature nucleation driving force, leading to detrimental Sn-rich phase precipitation and significant lattice strain. Herein, we introduce rubidium thiocyanate (RbSCN) as a multifunctional regulator to orchestrate the crystallization dynamics and strain evolution. SCN– selectively coordinates with Sn2+, retarding premature Sn-rich phase precipitation and synchronizing the growth rates of Sn/Pb-mixed phases. Simultaneously, Rb+ mitigates local lattice distortion, yielding structurally homogeneous films with minimized nonradiative recombination. Consequently, the optimized MA-free Sn–Pb device achieves a 22.92% power conversion efficiency (PCE) and exhibits enhanced operational stability. Integrating this into monolithic APTSCs realizes a PCE of 28.77% (TÜV-certified 28.53%). Notably, the VOC × FF product represents the highest value reported for MA-free APTSCs, highlighting the efficacy of synchronized crystallization in unleashing the potential of narrow-bandgap perovskites.

Official source

https://infoscience.epfl.ch/entities/publication/4e11ebbf-17d3-4fb7-a25f-3a168e26521f

About this result

This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.

Graph Chat

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4e11ebbf-17d3-4fb7-a25f-3a168e26521f

About this result

Related concepts (32)

Perovskite solar cell

A perovskite solar cell (PSC) is a type of solar cell that includes a perovskite-structured compound, most commonly a hybrid organic–inorganic lead or tin halide-based material as the light-harvesting active layer. Perovskite materials, such as methylammonium lead halides and all-inorganic cesium lead halide, are cheap to produce and simple to manufacture. Solar-cell efficiencies of laboratory-scale devices using these materials have increased from 3.8% in 2009 to 25.

Solar cell

A solar cell, or photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by the photovoltaic effect, which is a physical phenomenon. It is a form of photoelectric cell, defined as a device whose electrical characteristics, such as current, voltage, or resistance, vary when exposed to light. Individual solar cell devices are often the electrical building blocks of photovoltaic modules, known colloquially as solar panels.

Dye-sensitized solar cell

A dye-sensitized solar cell (DSSC, DSC, DYSC or Grätzel cell) is a low-cost solar cell belonging to the group of thin film solar cells. It is based on a semiconductor formed between a photo-sensitized anode and an electrolyte, a photoelectrochemical system. The modern version of a dye solar cell, also known as the Grätzel cell, was originally co-invented in 1988 by Brian O'Regan and Michael Grätzel at UC Berkeley and this work was later developed by the aforementioned scientists at the École Polytechnique Fédérale de Lausanne (EPFL) until the publication of the first high efficiency DSSC in 1991.

Related publications (32)

Suppressing Sn-Rich Phase Precipitation Enables Controlled Crystallization in MA-free Sn–Pb Perovskite Solar Cells

Chat with Graph Search

Reducing Interface Energy Loss of Perovskite Solar Cells by Molecular Engineering of Hole‐Transporting Materials

Perovskite databases analysis using machine learning and large language models for prediction and reverse engineering

Homogenizing interfacial assembly via indole-mediated binary monolayers for perovskite solar cells