Influence of end groups variation of self assembled monolayers on performance of planar perovskite solar cells by interface regulation

Arkan, Emre; Unal, Muhittin; Yalcin, Eyup; Arkan, M. Zeliha Yigit; Yurtdaş, Semih; Can, Mustafa; Tozlu, Cem; Demiç, Şerafettin

doi:10.1016/j.mssp.2020.105514

Cited by 19 publications

(17 citation statements)

References 51 publications

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“…Diffraction peaks of perovskite were observed at 2θ values of 14.14, 19.92, 23.54, 24.52, 28.48, 31.92, 34.62, 40.68, and 43.16°, which corresponded to the (110), (112), (211), (202), (220), (310), (224), and (314) planes, respectively. The presence of these peaks indicated the formation of a tetragonal phase in the perovskite crystal structure in the samples. − A very sharp peak could be observed at around 26.64°, corresponding to graphite’s basal (002) diffraction peak. Compared to FTO/TiO 2 /perovskite, the FTO/TiO 2 film only showed a small peak of TiO 2 at 25.5°, which represented the tetragonal anatase (101) structure of the mesoporous .…”

Section: Resultsmentioning

confidence: 99%

“…The presence of these peaks indicated the formation of a tetragonal phase in the perovskite crystal structure in the samples. 29 − 31 A very sharp peak could be observed at around 26.64°, corresponding to graphite’s basal (002) diffraction peak. Compared to FTO/TiO 2 /perovskite, the FTO/TiO 2 film only showed a small peak of TiO 2 at 25.5°, which represented the tetragonal anatase (101) structure of the mesoporous.…”

Section: Resultsmentioning

confidence: 99%

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Graphite/Carbon Black Counter Electrode Deposition Methods to Improve the Efficiency and Stability of Hole-Transport-Layer-Free Perovskite Solar Cells

et al. 2022

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The interfacial compatibility between the graphite/carbon black composite counter electrode (Gr/CB CE) and the perovskite layer is a crucial determinant of the performance of the hole-transport-layer-free carbon-based perovskite solar cells, and judicious selection of the Gr/CB CE application method is essential for achieving an optimum contact. In this work, three different types of Gr/CB CEs application methods are investigated: (1) deposition of Gr/CB on the fluorine-doped tin oxide (FTO) substrate, followed by clamping to the perovskite layer, (2) direct deposition of Gr/CB onto the perovskite layer, and (3) deposition of Gr/CB onto the PbI 2 precursor layer, followed by immersion in methylammonium iodide solution for the in situ conversion of PbI 2 to perovskite. The results revealed that Method 3 produced superior Gr/CB–perovskite contacts, resulting in up to 8.81% power conversion efficiency. The devices prepared using Method 3 also exhibited the best stability in the air, retaining 71.1% of their original efficiency after 1600 h of continuous testing. These results demonstrate that Gr/CB CEs can be considered excellent alternatives to the costly noble metals often employed in perovskite solar cells (PSCs) when deposited using a suitable technique.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Graphite/Carbon Black Counter Electrode Deposition Methods to Improve the Efficiency and Stability of Hole-Transport-Layer-Free Perovskite Solar Cells

et al. 2022

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“…It is important to note here that in accordance with literature outcomes, present results show that the existence of methyl pairs on the main backbone increases the electron density of molecules as well as reduces the oxidation potential and therefore causes an inflection point at lower potential. 36,[41][42][43] This is the possible explanation for the 0.15 eV difference between TB and DDA molecules. Moreover, the present findings are also consistent with the inductive effect phenomenon, which further evaluates the density of electron accumulation in the main molecular body, due to the types of linked hydrocarbon chains since the C-1 carbon atom of side chains in both molecules has the same hybridization (sp [3] ).…”

Section: Resultsmentioning

confidence: 94%

“…Among all surface parameters, contact angle and surface texture play crucial roles, in which topographical features and wetting behaviors are required to be defined, to evaluate the doping effect of molecules on fiber structures. 35,41,42 Therefore, sessile water droplet measurement was carried out to reveal alters in contact angles of all-fiber surfaces. In the general description, doping of any hydrophobic moieties decreases the surface tension and therefore increases the contact angle.…”

Section: Resultsmentioning

confidence: 99%

Molecular engineering‐device efficiency relation: Performance boosting of triboelectric nanogenerator through doping of small molecules

Arkan

Kınaş

Arkan

et al. 2022

Intl J of Energy Research

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Summary Triboelectric nanogenerators (TENGs) are promising new generation systems with their basic motion‐based working principle using both triboelectric and electrostatic effects. Today, the energy densities of TENGs are insufficient for many electronic devices and new strategies are needed to increase their power conversion efficiency. In this study, two different Perylene‐based organic structures were added to the triboelectric layers as well as the electrochemical properties of these structures, and the device parameters related to these properties were investigated. A large variety of instrumental analyses, including cyclic voltammetry, contact angle, scanning electron microscopy, atomic force microscopy, and so on, have been used to identify the relationship between doped molecules, their doping ratios, and obtained fiber structures. Depending on molecular structure and even any small variations in side groups of molecules, different doping rates brought about various device outputs. Compared with undoped layers, doping of small molecules led to a ~3.3 times increase in the maximum power of the best‐performed devices, and a very high voltage value of 500 V was obtained. The analysis of doping with small molecules undertaken here has extended our knowledge of how material design improves the electrical output and contributes to the device performance in TENGs.

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“…The same group designed and synthesized three SAMs bearing carboxyl acid as anchoring group, bithophene as linker, and varied terminal groups (triphenylamine for EA‐54, dimethoxydiphenylamine for EA‐58, carbazole for EA‐63). [ 191 ] Although the HOMO level of EA‐63 matched better with the VBM of MAPbI 3 and EA‐63‐based p–i–n PSC exhibited higher V OC , EA‐58‐based PSC afforded better PCE due to higher FF, which was attributed to the surface passivation of methoxy group through a coordination bond. Apart from the terminal group modification, they designed and synthesized two SAM‐HTLs to study the effect of linker group.…”

Section: Sam‐based Htl (Sam‐htl)mentioning

confidence: 99%

Organic Hole‐Transport Layers for Efficient, Stable, and Scalable Inverted Perovskite Solar Cells

et al. 2022

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Hole-transporting layers (HTLs) are an essential component in inverted, p-i-n perovskite solar cells (PSCs) where they play a decisive role in extraction and transport of holes, surface passivation, perovskite crystallization, device stability, and cost. Currently, the exploration of efficient, stable, highly transparent and low-cost HTLs is of vital importance for propelling p-i-n PSCs toward commercialization. Compared to their inorganic counterparts, organic HTLs offer multiple advantages such as a tunable bandgap and energy level, easy synthesis and purification, solution processability, and overall low cost. Here, recent progress of organic HTLs, including conductive polymers, small molecules, and self-assembled monolayers, as utilized in inverted PSCs is systematically reviewed and summarized. Their molecular structure, hole-transport properties, energy levels, and relevant device properties and resulting performances are presented and analyzed. A summary of design principles and a future outlook toward highly efficient organic HTLs in inverted PSCs is proposed. This review aims to inspire further innovative development of novel organic HTLs for more efficient, stable, and scalable inverted PSCs.

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Influence of end groups variation of self assembled monolayers on performance of planar perovskite solar cells by interface regulation

Cited by 19 publications

References 51 publications

Graphite/Carbon Black Counter Electrode Deposition Methods to Improve the Efficiency and Stability of Hole-Transport-Layer-Free Perovskite Solar Cells

Graphite/Carbon Black Counter Electrode Deposition Methods to Improve the Efficiency and Stability of Hole-Transport-Layer-Free Perovskite Solar Cells

Molecular engineering‐device efficiency relation: Performance boosting of triboelectric nanogenerator through doping of small molecules

Organic Hole‐Transport Layers for Efficient, Stable, and Scalable Inverted Perovskite Solar Cells

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