Relating Urbach energy and charge recombination in organic solar cells with small photovoltage loss
Grant Data
Project Title
Relating Urbach energy and charge recombination in organic solar cells with small photovoltage loss
Principal Investigator
Dr Chow, Chi Yung Philip
(Principal Investigator (PI))
Co-Investigator(s)
Professor Yan He
(Co-Investigator)
Duration
36
Start Date
2018-07-01
Amount
505298
Conference Title
Relating Urbach energy and charge recombination in organic solar cells with small photovoltage loss
Presentation Title
Keywords
Renewable energy
Discipline
Materials Sciences
HKU Project Code
16304218
Grant Type
General Research Fund (GRF)
Funding Year
2018
Status
Completed
Objectives
1. Characterise charge recombination dynamics in the model P3TEA:SF-PDI2 and PvBDTTAZ:O-IDTBR systems using a range of transient optical and electrical techniques. Identify various recombination processes present in this system, and determine the rate that corresponds to each radiative and non-radiative process. 2. Develop a range of related blends that are variants of the model P3TEA:SF-PDI2 and PvBDTTAZ:O-IDTBR with varying Urbach energies. This involves varying the processing condition or blending ratio of P3TEA:SF-PDI2 and PvBDTTAZ:O-IDTBR, and blending the model polymer with various other acceptor molecules (both fullerenes and non-fullerenes). 3. Using the selected blends developed in Objective #2, characterise charge recombination dynamics by identifying various recombination processes present and determine the corresponding rate. 4. Develop photo-chemical model that relates Urbach energy and charge recombination rates. Identify the optimal Urbach energy for suppressing non-radiative recombination processes and for optimising device performance.