Abstract:with outstanding optoelectronic properties. [1] In 2009, these materials were introduced in solar cells and have since established a striking increase in performance, reaching over 22% in stateof-the-art devices. [2] Here, the perovskite absorber is sandwiched between two selective charge extraction layers, that transport the charges to the electrodes. [3] Although efficient inorganic hole transporting materials (HTMs) have been reported, [4] the most well-known HTMs are the organic materials 2,2′,7,7′-tetraki… Show more
“…Following a previously published procedure, [ 3 ] the costs of the materials used for the synthesis were evaluated (detailed calculations can be found in the Supporting Information). The calculated price of the materials is 13.56 and 16.34€ g −1 for V1162 and V1187, respectively, which is somewhat higher than the lowest reported costs of organic HTMs (e.g., V950 ≈6€ g −1 [ 11 ] and EDOT–amide–TPA ≈5$ g −1 [ 27 ] ); however, it is significantly lower than that of the most popular HTM Spiro‐OMeTAD (93$ g −1 [ 28 ] ).…”
The development of the simple synthesis schemes of organic semiconductors can have an important contribution to the advancement of related technologies. In particular, one of the fields where the high price of the hole‐transporting materials may become an obstacle toward successful commercialization is perovskite solar cells. Herein, enamine‐based materials that are capable of undergoing cross‐linking due to the presence of two vinyl groups are synthesized. It is shown that new compounds can be thermally polymerized, making the films resistant to organic solvents. This can allow the use of a wet‐coating process for the deposition of the perovskite absorber film, without the need for orthogonal solvents. Cross‐linked films are used in perovskite solar cells, and, upon optimization of the film thickness, the highest power conversion efficiency of 18.1% is demonstrated.
“…Following a previously published procedure, [ 3 ] the costs of the materials used for the synthesis were evaluated (detailed calculations can be found in the Supporting Information). The calculated price of the materials is 13.56 and 16.34€ g −1 for V1162 and V1187, respectively, which is somewhat higher than the lowest reported costs of organic HTMs (e.g., V950 ≈6€ g −1 [ 11 ] and EDOT–amide–TPA ≈5$ g −1 [ 27 ] ); however, it is significantly lower than that of the most popular HTM Spiro‐OMeTAD (93$ g −1 [ 28 ] ).…”
The development of the simple synthesis schemes of organic semiconductors can have an important contribution to the advancement of related technologies. In particular, one of the fields where the high price of the hole‐transporting materials may become an obstacle toward successful commercialization is perovskite solar cells. Herein, enamine‐based materials that are capable of undergoing cross‐linking due to the presence of two vinyl groups are synthesized. It is shown that new compounds can be thermally polymerized, making the films resistant to organic solvents. This can allow the use of a wet‐coating process for the deposition of the perovskite absorber film, without the need for orthogonal solvents. Cross‐linked films are used in perovskite solar cells, and, upon optimization of the film thickness, the highest power conversion efficiency of 18.1% is demonstrated.
“…This perovskite composition has also proved to be more stable in thin-film solar cells with reported device efficiencies that surpass 20%. 32,33 First, we use PL spectroscopy to investigate the effects of the H 2 O 2 post-treatments on the optoelectronic properties of the perovskite films. In Figures 1A and 1B, we show steady-state and time-resolved PL measurements of thin films of FA 0.83 Cs 0.17 Pb(I 0.83 Br 0.17 ) 3 treated via the wet method.…”
Section: Oxidation With Hydrogen Peroxidementioning
The authors propose a comprehensive mechanism for the improvement to optoelectronic properties observed when metal halide perovskites are exposed to light and air in ambient conditions, a process known as photo-brightening. Hydrogen peroxide is shown to be the active reagent responsible, and the authors demonstrate its use as a simple and fast post-treatment, resulting in substantial improvements to photoluminescence and photovoltaic device performance.
“…The second one, Z30 based on phenothiazine, showed a slightly lower performance of 19.2% 134. Petrus et al introduced an amide-functionality in the backbone of HTMs to synthesize an EDOT-Amide-TPA material by a simple condensation reaction which showed a very high performance of 20.3% 135. Phenoxazine-based POZ10 reported by Chen and co-workers showed a PCE of 19.4% 136.…”
Doping of hole transporting materials typically increases the efficiency of perovskite solar cells but remains questionable for overall device stability.
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