Video Experimental Relacionado

Updated: Mar 7, 2026

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

Published on: January 10, 2017

Aprovechando el bloqueo conformacional no covalente como una estrategia de diseño para el receptor de electrones de

Yahui Liu¹, Zhe Zhang¹, Shiyu Feng¹

¹Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, Beijing Normal University , Beijing 100875, P. R. China.

Journal of the American Chemical Society

|February 23, 2017

Resumen

Los investigadores crearon un nuevo aceptador molecular pequeño con una estructura plana bloqueada, aumentando significativamente la eficiencia de la célula solar de polímero al 9,6%. Este diseño simplifica la síntesis y mejora el rendimiento para futuras aplicaciones de células solares.

Área de la Ciencia:

Ciencias de los materiales
Productos electrónicos orgánicos
Las instalaciones fotovoltaicas

Sus antecedentes:

El desarrollo de aceptores moleculares pequeños eficientes es crucial para el avance de las células solares poliméricas (PSC).
El logro de estructuras moleculares planas en los aceptores puede mejorar el transporte de carga y reducir las pérdidas de energía.
Los diseños de aceptores actuales a menudo enfrentan desafíos en la síntesis y el logro de una planaridad óptima.

Objetivo del estudio:

Diseñar y sintetizar un nuevo receptor molecular pequeño de anillo fundido con una estructura plana conformacionalmente bloqueada.
Investigar el impacto de esta conformación plana en las propiedades ópticas y electrónicas del aceptor.
Evaluar el rendimiento de las PSC utilizando este nuevo aceptor.

Principales métodos:

Síntesis de un nuevo aceptor molecular de anillo fundido con interacciones intramoleculares no covalentes para el bloqueo de conformación.
Fabricación y caracterización de células solares poliméricas (PSC) utilizando el aceptor desarrollado.
Análisis comparativo del rendimiento de las PSC con aceptores moleculares pequeños planos y no planos.

Principales resultados:

La conformación plana del nuevo aceptor se bloqueó con éxito a través de interacciones intramoleculares no covalentes.
La estructura plana condujo a un espectro de absorción ampliado, una mayor movilidad de electrones y una reducción de la pérdida de energía no radiativa.
Los PSC que incorporan el aceptor plano alcanzan una eficiencia de conversión de potencia (PCE) del 9,6%, una mejora significativa con respecto a los análogos no planos (2,3% PCE).

Conclusiones:

El bloqueo de la conformación a través de interacciones no covalentes intramoleculares es una estrategia efectiva para diseñar aceptores moleculares pequeños de alto rendimiento.
El aceptador desarrollado demuestra un potencial significativo para aplicaciones de células solares poliméricas de alta eficiencia.
Este enfoque de diseño ofrece una ruta sintética simplificada para los aceptadores moleculares pequeños avanzados para la energía fotovoltaica orgánica.

Más Videos Relacionados

Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

Well-aligned Vertically Oriented ZnO Nanorod Arrays and their Application in Inverted Small Molecule Solar Cells

Published on: April 25, 2018

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

Published on: March 2, 2021

Videos de Conceptos Relacionados

Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

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

Thermal Electrocyclic Reactions: Stereochemistry

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

Thermal and Photochemical Electrocyclic Reactions: Overview

Thermal and Photochemical Electrocyclic Reactions: Overview

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.

Cycloaddition Reactions: MO Requirements for Thermal Activation

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.

P-N junction

P-N junction

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...

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...