Albertus Adrian Sutanto

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Isomeric imidazole functionalized bithiophene-based hole transporting materials for stable perovskite solar cells

Min Chen, Mohammad Khaja Nazeeruddin, Albertus Adrian Sutanto, Jianxing Xia

2,2,7,7-tetrakis(N,N-dip-methoxyphenylamine)-9,9-spirobifluorene (spiro-OMeTAD) is a popular hole-transporting material (HTM) in perovskite solar cells (PSCs), However, it suffers from high-cost and stability issues, which need to be overcome for PSC commercial-ization. Here, we report isomers of bithiophene-based HTMs func-tionalized with triarylamine and imidazole for PSCs. The planar 3-ImBT-2D (1) exhibits higher hole mobility than 5-ImBT-2D (2) via modulation of donor-group positions. The PSCs using HTM (1) deliver an excellent power conversion efficiency (PCE) of 21.73% with Li-TFSI doping and 17.79% without dopants. In addition, the Li-TFSI-free device based on 3-ImBT-2D yields a PCE of 21% after HTM surface modification with organic p-dopant dimethylanilinium tetrakis(pentafluorophenyl)borate (DPB). A molecular dynamics study shows that the isomer 3-ImBT-2D (1) folds up after deposition on perovskite films. As a result, the Li-TFSI-free devices exhibit higher stability, retaining 95.9% of the initial PCE after 800 h aging.

ELSEVIER2023

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C-60 Thin Films in Perovskite Solar Cells: Efficient or Limiting Charge Transport Layer?

Cansu Igci, Hiroyuki Kanda, Nadja Isabelle Desiree Klipfel, Mohammad Khaja Nazeeruddin, Cristina Roldán Carmona, Albertus Adrian Sutanto

In this work, we identify the importance of C-60 and compact-TiO2 (cTiO(2)) as electron transport layers on the device performance of coevaporated n-i-p perovskite solar cells. We found (1) a synergetic effect between both layers when extracting the charges and (2) that optimization of the C-60 layer is essential for obtaining devices with enhanced device performance. In particular, we found that a C-60 layer of an optimum thickness (20 nm), an additional charge transport resistance is observed by impedance analysis, indicating that devices with nonoptimized C-60 thickness could limit the fabrication of highly efficient perovskite solar cells.

AMER CHEMICAL SOC2022

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New Spiro-OMeTAD analogues and the simpler "half" structures with the terminated methoxyphenyl and/or carbazolyl chromophores are successfully synthesized under Hartwig-Buchwald amination conditions using commercially available starting materials. New fluorene-based hole-transporting materials combined with suitable ionization energies properly align with the valence band of the perovskite absorber. Additionally, these compounds are amorphous, which is an advantage for the formation of homogenous films, as well as eliminate the possibility for films to crystallize during operation of the devices. The most efficient perovskite solar cells devices contain carbazolyl-terminated SpiroOMeTAD analogue V1267 and reach a power conversion efficiency of 18.3%, along with a short-circuit current density, open-circuit voltage, and fill factor of 23.41mA cm(-2), 1.06 V, and 74.0%, respectively. Moreover, "half" structures with methoxyphenyl/carbazolyl fragments show excellent long-term stability and outperform Spiro-OMeTAD and, therefore, hold a great prospect for practical wide-scale applications in optoelectronic devices.

WILEY-V C H VERLAG GMBH2022

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