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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Photosystem II01:22

Photosystem II

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Related Experiment Video

Updated: Apr 20, 2026

Flash Infrared Annealing for Perovskite Solar Cell Processing
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Flash Infrared Annealing for Perovskite Solar Cell Processing

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Photo-Tautomerization-Driven Energy Transfer at the Hole-Transport Interface Stabilizes Efficient Inverted Perovskite

Xin Chen1, Ping Xu1, Qi Wang1

  • 1School of Chemical Engineering, State Key Laboratory of Advanced Polymer Materials, Engineering Research Center of Alternative Energy Materials & Devices, Ministry of Education Sichuan University, Chengdu, P. R. China.

Angewandte Chemie (International Ed. in English)
|April 18, 2026
PubMed
Summary
This summary is machine-generated.

Perovskite solar cells (PSCs) are stabilized against UV degradation by incorporating N-(2-ethoxyphenyl)-N

Keywords:
Förster resonance energy transferUV‐absorberhole‐transportinterfacial energy lossperovskite photovoltaics

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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
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Area of Science:

  • Materials Science
  • Photovoltaics
  • Renewable Energy

Background:

  • Perovskite solar cells (PSCs) exhibit high power conversion efficiencies (PCEs).
  • UV-induced degradation is a major limitation for PSCs' practical application.
  • The instability of the [PbI6]4- octahedral framework under UV light contributes to degradation.

Purpose of the Study:

  • To enhance the UV-stress resilience and operational stability of PSCs.
  • To introduce a Förster resonance energy transfer (FRET) channel at the hole-transport layer (HTL)/perovskite interface.
  • To improve both the efficiency and stability of PSCs through a novel UV management strategy.

Main Methods:

  • Incorporation of the ultraviolet absorber N-(2-ethoxyphenyl)-N'-(2-ethylphenyl)oxamide (UV-312) into the HTL/perovskite interface.
  • Utilizing UV-312's enol-resonant configuration for ultrafast FRET (∼20 ps) under UV irradiation.
  • Mitigating MeO-2PACz aggregation and optimizing interfacial energy-level alignment with UV-312.

Main Results:

  • UV-312 facilitated ultrafast FRET, promoting charge separation and suppressing Pb-I bond dissociation.
  • The [PbI6]4- octahedral framework was preserved, enhancing UV-stress resilience.
  • Champion devices achieved 27.05% PCE (0.09 cm2) with high open-circuit voltage (1.186 V) and low non-radiative voltage loss (61 mV).
  • Performance scaled to 25.08% for 1 cm2 PSCs and 23.00% for 12.96 cm2 mini-modules.
  • Devices demonstrated robust operational stability under continuous light, heat, and UV stress.

Conclusions:

  • UV absorbers can function as active energy-management units.
  • The FRET channel strategy effectively addresses both efficiency and stability challenges in PSCs.
  • This approach offers a unified solution for advancing perovskite photovoltaics.