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Understanding of photophysical processes in dio additive-treated ptb7:Pc71 bm solar cells

Su, Xiaojun ; Hu, Rong ; Wen, Guanzhao ; Zou, Xianshao LU ; Qing, Mengyao ; Peng, Jun ; He, Xiaochuan and Zhang, Wei (2021) In Crystals 11(9).
Abstract

1,8-diiodooctane (DIO) additive is an important method for optimizing the morphology and device performance of polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7)-based polymer solar cells. However, the effect of DIO additive on charge photogeneration dynamics of PTB7-based polymer solar cells is still poorly understood. In this work, the effect of DIO additive on the carrier photogeneration dynamics, as well as device performance of PTB7: [6,6]-phenyl-C71-butyric acid methyl ester (PC71 BM) solar cells was studied. Bias-dependent photoluminescence (PL) experiments of a neat PTB7 device show that the exciton cannot be dissociated by the electric field in the device within the operating voltage range, but it can... (More)

1,8-diiodooctane (DIO) additive is an important method for optimizing the morphology and device performance of polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7)-based polymer solar cells. However, the effect of DIO additive on charge photogeneration dynamics of PTB7-based polymer solar cells is still poorly understood. In this work, the effect of DIO additive on the carrier photogeneration dynamics, as well as device performance of PTB7: [6,6]-phenyl-C71-butyric acid methyl ester (PC71 BM) solar cells was studied. Bias-dependent photoluminescence (PL) experiments of a neat PTB7 device show that the exciton cannot be dissociated by the electric field in the device within the operating voltage range, but it can be effectively dissociated by the high electric field. PL and time-resolved PL studies show that DIO additive reduces the phase size of PTB7 in the blend film, resulting in an increased exciton dissociation efficiency. The carrier recombination processes were studied by transient absorption, which shows geminate carrier recombination was suppressed in the DIO-treated PTB7:PC71 BM device in ultrafast time scale. The increased exciton dissociation efficiency and suppressed carrier recombination in ultrafast time scale play an important role for DIO-treated PTB7:PC71 BM solar cells to attain a higher power conversion efficiency.

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author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Carrier photogeneration, DIO additive, polymer solar cells, PTB7:PC BM
in
Crystals
volume
11
issue
9
article number
1139
publisher
MDPI AG
external identifiers
  • scopus:85115766748
ISSN
2073-4352
DOI
10.3390/cryst11091139
language
English
LU publication?
yes
id
7d90b53a-7165-4864-9c12-93d45262fed2
date added to LUP
2021-10-06 22:50:44
date last changed
2023-11-08 20:25:18
@article{7d90b53a-7165-4864-9c12-93d45262fed2,
  abstract     = {{<p>1,8-diiodooctane (DIO) additive is an important method for optimizing the morphology and device performance of polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7)-based polymer solar cells. However, the effect of DIO additive on charge photogeneration dynamics of PTB7-based polymer solar cells is still poorly understood. In this work, the effect of DIO additive on the carrier photogeneration dynamics, as well as device performance of PTB7: [6,6]-phenyl-C<sub>71</sub>-butyric acid methyl ester (PC<sub>71</sub> BM) solar cells was studied. Bias-dependent photoluminescence (PL) experiments of a neat PTB7 device show that the exciton cannot be dissociated by the electric field in the device within the operating voltage range, but it can be effectively dissociated by the high electric field. PL and time-resolved PL studies show that DIO additive reduces the phase size of PTB7 in the blend film, resulting in an increased exciton dissociation efficiency. The carrier recombination processes were studied by transient absorption, which shows geminate carrier recombination was suppressed in the DIO-treated PTB7:PC<sub>71</sub> BM device in ultrafast time scale. The increased exciton dissociation efficiency and suppressed carrier recombination in ultrafast time scale play an important role for DIO-treated PTB7:PC<sub>71</sub> BM solar cells to attain a higher power conversion efficiency.</p>}},
  author       = {{Su, Xiaojun and Hu, Rong and Wen, Guanzhao and Zou, Xianshao and Qing, Mengyao and Peng, Jun and He, Xiaochuan and Zhang, Wei}},
  issn         = {{2073-4352}},
  keywords     = {{Carrier photogeneration; DIO additive; polymer solar cells; PTB7:PC BM}},
  language     = {{eng}},
  number       = {{9}},
  publisher    = {{MDPI AG}},
  series       = {{Crystals}},
  title        = {{Understanding of photophysical processes in dio additive-treated ptb7:Pc<sub>71</sub> bm solar cells}},
  url          = {{http://dx.doi.org/10.3390/cryst11091139}},
  doi          = {{10.3390/cryst11091139}},
  volume       = {{11}},
  year         = {{2021}},
}