Journal
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
Volume 45, Issue 5, Pages 7806-7813Publisher
WILEY
DOI: 10.1002/er.6365
Keywords
benzothiadiazole acceptors; indoloindole; novel copolymer; organic electronics; organic solar cells; power conversion efficiency
Categories
Funding
- National Research Foundation of Korea [2018R1A2A1A05078734 : NRF-2019K1A3A1A39103027 : NRF-2018K2A9A1A06066082]
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The study reports the performance of a polymer solar cell with indoloindole as the donor block and varying degrees of fluorinated benzothiadiazole as the acceptor block. Fluorination of benzothiadiazole enhances crystallinity and planarity of the polymer backbone, leading to improved PSC properties. The solar cell using monofluorinated benzothiadiazole as donor achieved high power conversion efficiency and showed a homogeneous fibrous network in the blend film.
The performance of an array of donor-acceptor based bulk heterojunction (BHJ) polymer solar cells (PSC) containing indoloindole as a key donor block with varying degrees of fluorinated benzothiadiazole (BT) as an acceptor block is reported. Fluorination of BT can enhance crystallinity and planarity of the polymer backbone due to intramolecular F-S interactions. This also leads to deeper highest occupied molecular orbital (HOMO) energy levels leading to high J(SC) and V-OC. The PSC properties of this series of new copolymer donors blended with fullerene acceptors show a homogeneous and uniform fibrous network in the blend film. The most homogeneous film was achieved with monofluorinated BT (PFDHI-TFT) that resulted in better charge extraction pathway leading to high power conversion efficiency (PCE). The solar cell using PFDHI-TFT as donor and fullerene acceptor showed PCE of 5.98% with V-OC of 0.80 V, J(SC) of 10.56 mA cm(-2), and fill factor (FF) of 0.71, respectively, under AM 1.5G illumination (100 mW cm(-2)) in the absence of annealing.
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