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¹H NMR: Complex Splitting

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Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding

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Split-Standing Molecular Engineering for Textured Silicon/Perovskite Tandems.

Xiaonan Wang^1,2, Yuan Tian^1,2, Libing Yao²

¹State Key Laboratory of Silicon and Advanced Semiconductor Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|June 25, 2025

Summary

A new hole-selective layer (HSL) material, DPAICz, enhances stability and efficiency in silicon/perovskite tandem solar cells. This innovation overcomes challenges in uniform coverage on textured silicon, improving overall device performance and longevity.

Keywords:

anchoring stability hole‐selective layers indolocarbazole inverted perovskite solar cells textured silicon/perovskite tandem solar cells

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Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Textured silicon/perovskite tandem solar cells are crucial for minimizing reflection losses and enabling industrial-scale production.
Uniform and stable coverage of textured silicon substrates with hole-selective layers (HSL) is a significant challenge in current research.

Purpose of the Study:

To develop a novel HSL material, DPAICz, specifically designed for stable and efficient performance on textured silicon substrates.
To investigate the structural and electronic properties of DPAICz and their impact on solar cell performance.

Main Methods:

Synthesis and characterization of the DPAICz HSL material.
Fabrication and testing of wide-bandgap perovskite solar cells and monolithic silicon/perovskite tandem solar cells using DPAICz.
Evaluation of device efficiency, stability, and interfacial properties.

Main Results:

DPAICz demonstrates superior anchoring stability on textured silicon compared to conventional HSLs due to its π-expanded core and split-standing configuration.
DPAICz exhibits enhanced hole extraction efficiency, leading to a champion PCE of 23.42% in perovskite solar cells.
Monolithic silicon/perovskite tandem solar cells with DPAICz achieved a remarkable PCE of 32.55% over a 1 cm² area.
Unencapsulated tandem devices showed enhanced long-term operational stability, retaining 96% of initial PCE after 880 hours of light soaking.

Conclusions:

DPAICz is a highly effective HSL material for textured silicon substrates, significantly improving the performance and stability of perovskite and tandem solar cells.
The unique molecular design of DPAICz addresses key challenges in HSL application for industrial-scale solar cell manufacturing.
This work paves the way for more efficient and durable silicon/perovskite tandem solar technologies.