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Related Concept Videos

P-N junction01:11

P-N junction

485
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...
485
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

309
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
309

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Related Experiment Video

Updated: Jun 13, 2025

Developing High Performance GaP/Si Heterojunction Solar Cells
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High-Efficiency Silicon Solar Cells with Chemical and Field-Effect Passivation Using Novel 2PACz/MoOx Hole-Selective

Qianfeng Gao1,2,3,4, Jianghao Liu1,2,3,4, Zhiyuan Xu1,2,3,4

  • 1Institute of Photoelectronic Thin Film Devices and Technology of Nankai University, Tianjin, 300350, China.

Small (Weinheim an Der Bergstrasse, Germany)
|April 16, 2025
PubMed
Summary

A new organic molecule, 2PACz, enhances crystalline silicon solar cells by improving the hole transport layer. This novel approach boosts efficiency and performance in silicon-based photovoltaics.

Keywords:
2PACzhole transport layermolybdenum oxideself‐assembled monolayer (SAM)silicon heterojunction solar cells

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Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition
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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Photovoltaics

Background:

  • Dopant-free crystalline silicon (c-Si) solar cells require efficient hole transport layers (HTLs).
  • Conventional molybdenum oxide (MoOx) HTLs face challenges like interface oxidation and poor electron blocking.
  • Self-assembled monolayers (SAMs) show promise in organic photovoltaics but are underexplored in silicon HTLs.

Purpose of the Study:

  • To introduce a novel organic SAM, 2PACz, for MoOx-based HTLs in c-Si solar cells.
  • To investigate the passivation effects of 2PACz on the MoOx interface.
  • To enhance solar cell performance through improved interface properties and passivation.

Main Methods:

  • Fabrication of a novel 2PACz/MoOx HTL structure.
  • Coordination of phosphonic acid (PA) groups in 2PACz with MoOx.
  • Characterization of interface properties, work function, and minority carrier lifetime.
  • Fabrication and testing of c-Si solar cells utilizing the 2PACz/MoOx stack.

Main Results:

  • 2PACz incorporation increased MoOx work function by 0.66 eV.
  • Significant improvement in minority carrier lifetime observed.
  • Built-in potential (Vbi) increased to 1.06 V.
  • Achieved a champion solar cell efficiency (Eff) of 23.90% with Voc = 753.3 mV, Jsc = 40.10 mA cm-2, and FF = 79.12%.

Conclusions:

  • The novel 2PACz SAM effectively passivates the MoOx interface in c-Si solar cells.
  • This strategy enhances both chemical and field-effect passivation, boosting Voc and Jsc.
  • 2PACz offers a promising new avenue for optimizing HTLs in c-Si solar cells and other optoelectronic devices.