Over 20% Efficient and Stable Non-Fullerene-Based Ternary Bulk-Heterojunction Organic Solar Cell with WS2 Hole-Transport Layer and Graded Refractive Index Antireflection Coating

Kiran Sreedhar Ram, Jai Singh

Research output: Contribution to journalArticle

Abstract

The power conversion efficiency (PCE) of a ternary organic solar cell (TOSC) with an active layer consisting of PBDB-T-2F and two non-fullerene materials Y6 and SF(BR)4 is simulated. Tungsten disulphide (WS2) is used as the hole transport layer (HTL) to reduce the contact resistance between the active layer and anode which enhances the internal quantum efficiency to 91.7%. It is found that the use of a highly absorbing non-fullerene small molecule acceptor, SF(BR)4, enhances the absorption as well as improves the stability. Finally, the incorporation of the graded refractive index coating, in the form of moth-eye shaped nanostructures, on the top of glass reduces the reflection losses and enhances the transmission coefficient from 0.88 to 0.94. Thus, the TOSC simulated here, of the structure moth-eye-AR/glass/ITO/WS2/PBDB-T-2F:Y6:SF(BR)4/PFN-Br/Al, produces a PCE of 20.87%. The results presented in this paper are expected to provide useful guidance for fabricating highly efficient and stable hybrid bulk-heterojunction solar cells.

Original languageEnglish
Article number2000047
Pages (from-to)1-8
Number of pages8
JournalAdvanced Theory and Simulations
Volume3
Issue number6
Early online date10 May 2020
DOIs
Publication statusPublished - Jun 2020

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