TY - JOUR
T1 - Enhancing the power conversion of the perovskite solar cells via structural tuning of BTT(DPP)3-based low bandgap hole transporting material
AU - Suranagi, Sanjaykumar R.
AU - Singh, Ranbir
AU - Kim, Min
N1 - Publisher Copyright:
© 2018
PY - 2019/4
Y1 - 2019/4
N2 - Three solution-processed star-shaped small molecules (SMs) based on benzo[1,2-b:3,4-bꞌ:5,6-bꞌꞌ]trithiophene (BTT) and 1,4-diketo-3,6-dithienylpyrrolo[3,4-c]pyrrole (DPP) building blocks have been synthesized and used as hole transport material (HTM) in perovskite solar cells (PSCs). The physical, optical and electrical properties of the SMs are studied in detail. The fine tuning of molecular structures have made to achieve the power conversion efficiency (PCE) of PSCs up to 14.13% for BTT(DPP-Th)3-EH over the other two (BTT(DPP)3-C8 (8.65%) and BTT(DPP)3-EH (8.39%) SMs. The enhanced solar cell performance majorly attributed to the high hole mobility (1.26 × 10−3 cm2 V−1 s−1) through nanofibril structured morphology of BTT(DPP-Th)3-EH. The molecular orientation and crystalline properties of SMs in the solid-state are investigated and correlated with their solar cell properties, by employing grazing incidence X-ray diffraction (GIXRD) measurements. In addition, light intensity (I) dependent current density-voltage (J-V) studies are also carried out to understand the effect of second-order bimolecular recombination and extent of the trap-assisted recombination in the PSC devices.
AB - Three solution-processed star-shaped small molecules (SMs) based on benzo[1,2-b:3,4-bꞌ:5,6-bꞌꞌ]trithiophene (BTT) and 1,4-diketo-3,6-dithienylpyrrolo[3,4-c]pyrrole (DPP) building blocks have been synthesized and used as hole transport material (HTM) in perovskite solar cells (PSCs). The physical, optical and electrical properties of the SMs are studied in detail. The fine tuning of molecular structures have made to achieve the power conversion efficiency (PCE) of PSCs up to 14.13% for BTT(DPP-Th)3-EH over the other two (BTT(DPP)3-C8 (8.65%) and BTT(DPP)3-EH (8.39%) SMs. The enhanced solar cell performance majorly attributed to the high hole mobility (1.26 × 10−3 cm2 V−1 s−1) through nanofibril structured morphology of BTT(DPP-Th)3-EH. The molecular orientation and crystalline properties of SMs in the solid-state are investigated and correlated with their solar cell properties, by employing grazing incidence X-ray diffraction (GIXRD) measurements. In addition, light intensity (I) dependent current density-voltage (J-V) studies are also carried out to understand the effect of second-order bimolecular recombination and extent of the trap-assisted recombination in the PSC devices.
KW - Benzotrithiophene
KW - Diketopyrrolopyrrole
KW - Hole transporting materials
KW - Methylammonium lead iodide
KW - Perovskite solar cells
KW - Star-shaped small molecules
UR - http://www.scopus.com/inward/record.url?scp=85058782809&partnerID=8YFLogxK
U2 - 10.1016/j.dyepig.2018.12.034
DO - 10.1016/j.dyepig.2018.12.034
M3 - Article
AN - SCOPUS:85058782809
SN - 0143-7208
VL - 163
SP - 525
EP - 532
JO - Dyes and Pigments
JF - Dyes and Pigments
ER -