Phenothiazine‐Based D–A–π–A Dyes for Highly Efficient Dye‐Sensitized Solar Cells: Effect of Internal Acceptor and Non‐Conjugated π‐Spacer on Device Performance. Issue 2 (26th October 2016)

• Record Type: Journal Article
• Authors: Nagane, Satyawan; Ichake, Amol; Agrawal, Ishita; Sadhanala, Aditya; Friend, Richard H.; Ogale, Satishchandra; Wadgaonkar, Prakash P.
• Is Part Of: ChemPlusChem. Volume 82:Issue 2(2017)
• Page Start: 280
• Page End: 286
• Publication Date: 2016-10-26
• Subjects: dye-sensitized solar cells -- internal acceptors -- phenothiazines -- Urbach energy; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cplu.201600492
• Languages: English
• ISSNs: 2192-6506

Abstract

Abstract: Three newD –A–π–A metal‐free organic dyes based on phenothiazine as a donor (D) and non‐conjugated π‐spacer were designed and synthesized. The incorporation of different 'internal acceptors' (electron traps) such as benzothiadiazole (BTD), benzotriazole (BTA), and pyridine were shown to allow systematic tuning of the energy levels and the photophysical properties. TheAI‐1 dye showed lower electronic disorder compared with the other two dyes. The efficiencies achieved withAI‐1, AI‐2, andAI‐3 dyes were 8.5 % ( J sc =15.42 mA cm −2, V oc =0.78 V, FF=68 %), 7 % ( J sc =12.8 mA cm −2, V oc =0.78 V, FF=68 %) and 6.7 % ( J sc =11.57 mA cm −2, V oc =0.82 V, FF=68.26 %), respectively. The incorporation of non‐conjugated phenothiazine as a π‐spacer in D–A–π–A dyes showed remarkable enhancement in the photovoltaic performance of dye‐sensitized solar cell (DSSC) devices. The sealed DSSC devices with iodide/tri‐iodide (I − /I3 − )‐based liquid electrolyte showed promising stability under ambient conditions. Abstract : Organic dyes for solar cells : Three newD –A–π–A metal‐free organic dyes based on phenothiazine as a donor (D) and non‐conjugated π‐spacer were designed and synthesized. The incorporation of different 'internal acceptors' (electron traps) such as benzothiadiazole (BTD), benzotriazole (BTA), and pyridine were shown to allow systematic tuning of the energy levels and the photophysical properties. The best dye (AL‐1 ) shows an efficiency of 8.5 % ( J sc =15.42 mA cm −2, V oc =0.78 V, FF=68 %).