Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/33888
Title: | Excitons Dominate the Emission from PM6:Y6 Solar Cells, but This Does Not Help the Open-Circuit Voltage of the Device | Authors: | Perdigon-Toro, Lorena Le Quang Phuong Zeiske, Stefan VANDEWAL, Koen Armin, Ardalan Shoaee, Safa Neher, Dieter |
Issue Date: | 2021 | Publisher: | AMER CHEMICAL SOC | Source: | ACS Energy Letters, 6 (2) , p. 557 -564 | Abstract: | Non-fullerene acceptors (NFAs) are far more emissive than their fullerene-based counterparts. Here, we study the spectral properties of photocurrent generation and recombination of the blend of the donor polymer PM6 with the NFA Y6. We find that the radiative recombination of free charges is almost entirely due to the re-occupation and decay of Y6 singlet excitons, but that this pathway contributes less than 1% to the total recombination. As such, the open-circuit voltage of the PM6:Y6 blend is determined by the energetics and kinetics of the charge-transfer (CT) state. Moreover, we find that no information on the energetics of the CT state manifold can be gained from the low-energy tail of the photovoltaic external quantum efficiency spectrum, which is dominated by the excitation spectrum of the Y6 exciton. We, finally, estimate the charge-separated state to lie only 120 meV below the Y6 singlet exciton energy, meaning that this blend indeed represents a high-efficiency system with a low energetic offset. | Notes: | Neher, D (corresponding author), Univ Potsdam, Inst Phys & Astron, Soft Matter Phys & Optoelect, D-14476 Potsdam, Germany. rieher@uni.potsdam.de |
Other: | Neher, D (corresponding author), Univ Potsdam, Inst Phys & Astron, Soft Matter Phys & Optoelect, D-14476 Potsdam, Germany. rieher@uni.potsdam.de | Document URI: | http://hdl.handle.net/1942/33888 | ISSN: | 2380-8195 | e-ISSN: | 2380-8195 | DOI: | 10.1021/acsenergylett.0c02572 | ISI #: | WOS:000619803400032 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
acsenergylett.0c02572.pdf Restricted Access | Published version | 1.58 MB | Adobe PDF | View/Open Request a copy |
MS_R1_Perdigon-Toro Neher_emission PM6-Y6.pdf | Peer-reviewed author version | 1.48 MB | Adobe PDF | View/Open |
WEB OF SCIENCETM
Citations
59
checked on Apr 23, 2024
Page view(s)
44
checked on Sep 7, 2022
Download(s)
110
checked on Sep 7, 2022
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.