Back to Search Start Over

Thermal-Induced Performance Decay of the State-of-the-Art Polymer: Non-Fullerene Solar Cells and the Method of Suppression

Authors :
Xingxing Qin
Xuelai Yu
Zerui Li
Jin Fang
Lingpeng Yan
Na Wu
Mathias Nyman
Ronald Österbacka
Rong Huang
Zhiyun Li
Chang-Qi Ma
Source :
Molecules, Vol 28, Iss 19, p 6856 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

Improving thermal stability is of great importance for the industrialization of polymer solar cells (PSC). In this paper, we systematically investigated the high-temperature thermal annealing effect on the device performance of the state-of-the-art polymer:non-fullerene (PM6:Y6) solar cells with an inverted structure. Results revealed that the overall performance decay (19% decrease) was mainly due to the fast open-circuit voltage (VOC, 10% decrease) and fill factor (FF, 10% decrease) decays whereas short circuit current (JSC) was relatively stable upon annealing at 150 °C (0.5% decrease). Pre-annealing on the ZnO/PM6:Y6 at 150 °C before the completion of cell fabrication resulted in a 1.7% performance decrease, while annealing on the ZnO/PM6:Y6/MoO3 films led to a 10.5% performance decay, indicating that the degradation at the PM6:Y6/MoO3 interface is the main reason for the overall performance decay. The increased ideality factor and reduced built-in potential confirmed by dark J − V curve analysis further confirmed the increased interfacial charge recombination after thermal annealing. The interaction of PM6:Y6 and MoO3 was proved by UV-Vis absorption and XPS measurements. Such deep chemical doping of PM6:Y6 led to unfavorable band alignment at the interface, which led to increased surface charge recombination and reduced built-in potential of the cells after thermal annealing. Inserting a thin C60 layer between the PM6:Y6 and MoO3 significantly improved the cells’ thermal stability, and less than 2% decay was measured for the optimized cell with 3 nm C60.

Details

Language :
English
ISSN :
28196856 and 14203049
Volume :
28
Issue :
19
Database :
Directory of Open Access Journals
Journal :
Molecules
Publication Type :
Academic Journal
Accession number :
edsdoj.2de2ecdf4ff24493bc27bdb152130a56
Document Type :
article
Full Text :
https://doi.org/10.3390/molecules28196856