Related Experiment Video
Updated: May 10, 2026

Development of Efficient OLEDs from Solution Deposition
Published on: November 4, 2022
Ultrafast energy transfer in ultrathin organic donor/acceptor blend
Ajay Ram Srimath Kandada1, Giulia Grancini, Annamaria Petrozza
1dipartimento di Fisica, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
Abstract:
It is common knowledge that poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blend, a prototype system for bulk heterojunction (BHJ) solar cells, consists of a network of tens of nanometers-large donor-rich and acceptor-rich phases separated by extended finely intermixed border regions where PCBM diffuse into P3HT. Here we specifically address the photo-induced dynamics in a 10 nm thin P3HT/PCBM blend that consists of the intermixed region only. Using the multi-pass transient absorption technique (TrAMP) that enables us to perform ultra high sensitive measurements, we find that the primary process upon photoexcitation is ultrafast energy transfer from P3HT to PCBM. The expected charge separation due to hole transfer from PCBM to P3HT occurs in the 100 ps timescale. The derived picture is much different from the accepted view of ultra-fast electron transfer at the polymer/PCBM interface and provides new directions for the development of efficient devices.
More Related Videos
11:44Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
Published on: October 18, 2018
06:49In 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
Related Concept Videos
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
Energy to Drive Translocation
Generally, polypeptides are unfolded by two distinct...
UV–Vis Spectroscopy: Molecular Electronic Transitions
IR Absorption Frequency: Delocalization
In IR spectroscopy,...
Thermal and Photochemical Electrocyclic Reactions: Overview