TY - JOUR
T1 - High-Performance and Stable Nonfullerene Acceptor-Based Organic Solar Cells for Indoor to Outdoor Light
AU - Park, Sungmin
AU - Ahn, Hyungju
AU - Kim, Ji Yeong
AU - Park, Jong Baek
AU - Kim, Junghwan
AU - Im, Sang Hyuk
AU - Son, Hae Jung
N1 - Funding Information:
This work was supported by the Global Frontier R&D Program on Center for Multiscale Energy System (2015R1A1A1A05001115), the KIST Young Fellow program, and the Basic Research in Science & Engineering Program of National Research Foundation of Korea (NRF-2019R1A2C2088022).
PY - 2020/1/10
Y1 - 2020/1/10
N2 - We synthesized a donor polymer of bis(2-ethylhexyl)thiophene-substituted benzodithiophene (BDT-Th) and 1,3-bis(2-ethylhexyl)-5,7-di(thiophene-2-yl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione, for which the BDT-Th unit includes chlorine and sulfur-bridged 2-ethylhexyl in the thiophene side group. When compared with PBDB-TF, which includes fluorine and 2-ethylhexyl in BDT-Th, PBDB-TSCl shows more efficient exciton dissociation and charge generation, which is probably because large dipole moment changes from ground to excited states lead to reduced exciton binding energy. Consequently, despite a small donor-acceptor interface in the bulk heterojunction (BHJ) film, PBDB-TSCl achieves higher photovoltaic performance than PBDB-TF under various light intensities; PBDB-TSCl achieved higher efficiency (13.13%) than the 12.12% of PBDB-TF under 1 sun illumination. Moreover, PBDB-TSCl showed the highest efficiency of 21.53% with fill factor (FF) of 76.29% under a 500 lx fluorescence lamp, whereas PBDB-TF has lower efficiency of 15.57% with FF of 65.25%. Furthermore, the PBDB-TSCl device shows improved thermal stability due to the more stabilized morphology of its BHJ film.
AB - We synthesized a donor polymer of bis(2-ethylhexyl)thiophene-substituted benzodithiophene (BDT-Th) and 1,3-bis(2-ethylhexyl)-5,7-di(thiophene-2-yl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione, for which the BDT-Th unit includes chlorine and sulfur-bridged 2-ethylhexyl in the thiophene side group. When compared with PBDB-TF, which includes fluorine and 2-ethylhexyl in BDT-Th, PBDB-TSCl shows more efficient exciton dissociation and charge generation, which is probably because large dipole moment changes from ground to excited states lead to reduced exciton binding energy. Consequently, despite a small donor-acceptor interface in the bulk heterojunction (BHJ) film, PBDB-TSCl achieves higher photovoltaic performance than PBDB-TF under various light intensities; PBDB-TSCl achieved higher efficiency (13.13%) than the 12.12% of PBDB-TF under 1 sun illumination. Moreover, PBDB-TSCl showed the highest efficiency of 21.53% with fill factor (FF) of 76.29% under a 500 lx fluorescence lamp, whereas PBDB-TF has lower efficiency of 15.57% with FF of 65.25%. Furthermore, the PBDB-TSCl device shows improved thermal stability due to the more stabilized morphology of its BHJ film.
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U2 - 10.1021/acsenergylett.9b01819
DO - 10.1021/acsenergylett.9b01819
M3 - Article
AN - SCOPUS:85077599073
SN - 2380-8195
VL - 5
SP - 170
EP - 179
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 1
ER -
