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Use of the Phen‐NaDPO:Sn(SCN) 2 Blend as Electron Transport Layer Results to Consistent Efficiency Improvements in Organic and Hybrid Perovskite Solar Cells
Author(s) -
Seitkhan Akmaral,
Neophytou Marios,
Kirkus Mindaugas,
AbouHamad Edy,
Hedhili Mohamed Nejib,
Yengel Emre,
Firdaus Yuliar,
Faber Hendrik,
Lin Yuanbao,
Tsetseris Leonidas,
McCulloch Iain,
Anthopoulos Thomas D.
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201905810
Subject(s) - energy conversion efficiency , perovskite (structure) , materials science , ternary operation , organic solar cell , layer (electronics) , heterojunction , molecule , electron , chemical engineering , crystallography , nanotechnology , optoelectronics , organic chemistry , chemistry , polymer , physics , quantum mechanics , computer science , engineering , composite material , programming language
Abstract A simple approach that enables a consistent enhancement of the electron extracting properties of the widely used small‐molecule Phen‐NaDPO and its application in organic solar cells (OSCs) is reported. It is shown that addition of minute amounts of the inorganic molecule Sn(SCN) 2 into Phen‐NaDPO improves both the electron transport and its film‐forming properties. Use of Phen‐NaDPO:Sn(SCN) 2 blend as the electron transport layer (ETL) in binary PM6:IT‐4F OSCs leads to a remarkable increase in the cells' power conversion efficiency (PCE) from 12.6% (Phen‐NaDPO) to 13.5% (Phen‐NaDPO:Sn(SCN) 2 ). Combining the hybrid ETL with the best‐in‐class organic ternary PM6:Y6:PC 70 BM systems results to a similarly remarkable PCE increase from 14.2% (Phen‐NaDPO) to 15.6% (Phen‐NaDPO:Sn(SCN) 2 ). The consistent PCE enhancement is attributed to reduced trap‐assisted carrier recombination at the bulk‐heterojunction/ETL interface due to the presence of new energy states formed upon chemical interaction of Phen‐NaDPO with Sn(SCN) 2 . The versatility of this hybrid ETL is further demonstrated with its application in perovskite solar cells for which an increase in the PCE from 16.6% to 18.2% is also demonstrated.