Alkylthienyl substituted asymmetric 2D BDT and DTBT-based polymer solar cells with a power conversion efficiency of 9.2%

Abstract

An alkyl thiophene unit was employed for the first time as a side chain substituent on an asymmetric benzodithiophene (BDT) building block in the design of novel light-harvesting polymers.

Chlorination strategy on polymer donors toward efficient solar conversions

“…Bulk heterojunction (BHJ) polymer solar cells (PSCs), comprising conjugated polymer as electron donor and fullerene or nonfullrene derivatives as electron acceptor, have been drawing extensive attentions because of their advantages of low cost, large-area solution processability, light weight, mechanical flexibility and the great potential for commercial applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] . Especially the nonfullerence polymer solar cells have shown a new direction for photovoltaic study due to the rapid development in PCE [21][22][23][24] .…”

The effect of side-chain substitution on the aggregation and photovoltaic performance of diketopyrrolopyrrole-alt-dicarboxylic ester bithiophene polymers

“…Since the power conversion efficiency is the product of short-circuit current density (J sc ), open-circuit voltage (V oc ) and ll factor, all three need to be maximized to obtain good efficiency. J sc is directly related to the external quantum efficiency which has already been shown to reach up to or over 80% in favourable cases, 10,11 ensuring good current generation and extraction. The ll factor, a measure for charge transport and extraction, has also been shown to reach to high values.…”

Region Asymmetric Polymers Based on Fluorinated Benzothiadiazole-Benzodithiophene for Polymer Solar Cells with High Open-Circuit Voltage

“…As shown in Figure 7, the hole and electron mobilities (μh and μe) were estimated to be 1.46 × 10 -3 and 2.09×10 -3 cm 2 V -1 s -1 for PR2F:PC61BM blend, and 4.05 × 10 -5 and 7.74 × 10 -3 cm 2 V -1 s -1 for PR1F:PC61BM blend. The relatively high and balanced charge carrier mobilities of PR2F-based device indicates that the generated electrons and holes transfer efficiently in the active blend layer, thus giving rise to higher JSC and FF than those of PR1F-based device [31,32].…”