Nonhalogen solvent-processed polymer solar cells based on chlorine and trialkylsilyl substituted conjugated polymers achieve 12.8% efficiency

Abstract

A novel chlorine and alkylsilyl substituted polymer PBZ-ClSi was synthesized and the nonhalogen solvent-processed PSCs achieved an efficiency of 12.8%.

Fluorinated Photovoltaic Materials for High‐Performance Organic Solar Cells

“…[6,9,10] As ar esult, the BTz-based polymers display aW BG, high crystallinity,h igh extinction coefficient, and good hole mobility.C onsequently,B Tz-based polymer donors have developed rapidly and have been widely used in NBG SM-acceptorbased OSCs. [38][39][40] Nevertheless, the high HOMO levels of early BTz-based polymers limit their application in photovoltaic materials.T or educe the HOMO level of BTz-based polymers, You et al synthesized ad ifluorinated benzotriazole (2fBTz) unit, and developed the polymer PBnDT-FTAZ. [41] Comparedw ith its non-fluorinated analogue, PBnDT-FTAZ showedadramatic increase in PCE from about 4t o7%, owing to improved V oc and FF values.…”

“…Recently,t he group of Li developedaseries of BDT-T-alt-2fBTz-structured efficient polymers by modifying the thienyl-conjugated side chains on the 2D BDT unit. [6,9,10,[38][39][40] For example, polymer J61 [38] was synthesized by introducing al- Reprinted with permission. [19] Copyright 2016, American Chemical Society.…”

“…As a result, the BTz‐based polymers display a WBG, high crystallinity, high extinction coefficient, and good hole mobility. Consequently, BTz‐based polymer donors have developed rapidly and have been widely used in NBG SM‐acceptor‐based OSCs . Nevertheless, the high HOMO levels of early BTz‐based polymers limit their application in photovoltaic materials.…”

“…Compared with its non‐fluorinated analogue, PBnDT‐FTAZ showed a dramatic increase in PCE from about 4 to 7 %, owing to improved V oc and FF values. Recently, the group of Li developed a series of BDT‐T‐ alt ‐2fBTz‐structured efficient polymers by modifying the thienyl‐conjugated side chains on the 2D BDT unit . For example, polymer J61 was synthesized by introducing alkylthio groups into thienyl side chains, targeting a downshifted HOMO level and improved crystallinity.…”

Printable and Large‐Area Organic Solar Cells Enabled by a Ternary Pseudo‐Planar Heterojunction Strategy

“…Due to the advantages of simple preparation and good film quality, spin-coating has become the conventional method for preparing OSCs. [27][28][29][30][31] Unfortunately, in the process of preparing the active layer film by spin-coating, the active layer solution will be thrown out of the substrate, causing material waste. At the same time, as the effective area increases, the thickness of active layer film will be uneven because of the different forces at the substrate center and edges.…”