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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Visibly Transparent Monolithic Perovskite/Organic Tandem Solar Cells Achieving Over 6% Light-Utilization Efficiency.

Jun Ryu1, Seojun Lee1, Un-Hak Lee2

  • 1Department of Smart Cities, Chung-Ang University, Seoul, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|December 27, 2025
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Summary

This study introduces a novel perovskite/organic tandem solar cell for transparent windows, achieving high power and clarity. The new design sets a record for light-utilization efficiency in visibly transparent tandem devices.

Keywords:
organicperovskiteselective absorptiontandem solar cellsultra‐wide bandgapvisibly transparent

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Optoelectronics

Background:

  • Transparent photovoltaics (TPVs) are crucial for integrating solar energy into building facades.
  • Existing TPVs often compromise between visible light transmittance and power conversion efficiency (PCE).
  • Perovskite/organic tandem solar cells offer a promising route to high-performance TPVs.

Purpose of the Study:

  • To develop a monolithic perovskite/organic tandem solar cell that maximizes light-utilization efficiency (LUE) while maintaining high visible transparency (AVT).
  • To establish design principles for co-optimizing optical and electrical properties in TPVs.
  • To achieve record performance for visibly transparent tandem devices.

Main Methods:

  • Fabrication of a monolithic tandem solar cell using an ultra-wide-bandgap perovskite top cell and a ternary organic bottom cell.
  • Selective spectral absorption design to decouple visible light from photocurrent generation.
  • Minimization of voltage loss and recombination through careful material and interface engineering.

Main Results:

  • The perovskite top cell achieved 65.68% AVT and 8.23% PCE (5.46% LUE).
  • The monolithic tandem device reached 10.91% PCE at 55.39% AVT, with an LUE of 6.04%.
  • A record open-circuit voltage (VOC) of 2.38 V was achieved for a visibly transparent monolithic perovskite/organic tandem device surpassing 6% LUE at ≥ 50% AVT.

Conclusions:

  • The developed perovskite/organic tandem solar cell demonstrates a new benchmark for transparent photovoltaic applications.
  • Optical-electrical co-design strategies are essential for advancing high-clarity, power-generating glazing.
  • This work provides guidelines for future development of efficient and transparent solar energy solutions.