Two dimensional graphitic carbon nitride quantum dots modified perovskite solar cells and photodetectors with high performances

Harnessing the Potential of Graphitic Carbon Nitride for Optoelectronic Applications

“…The routes to g-CN have been examined in many reviews such as those by Volokh et al, [5] Zhao et al, [6] Ghosh and Pal, [12] Ong et al, [10] Kessler et al, [23] Xu and Shalom, [26] Bian et al, [27] and Barrio et al [31] The common precursors and methods are summarized in Figure 3 and Table 1 but are not described in detail to avoid a lengthy discussion. In general, bulk CN is synthesized by the polycondensation of nitrogen-rich precursors such as melamine, [32][33][34][35][36][37][38][39] urea, [40][41][42][43][44] cyanamide, [45] dicyandiamide, [46][47][48][49][50][51][52] and benzoguanamine. [53][54][55][56] Direct thermal polycondensation (calcination) is the most popular of the synthetic methods because of its simplicity and cost efficiency.…”

A Review on Emerging Efficient and Stable Perovskite Solar Cells Based on g-C3N4 Nanostructures

“…In conclusion, the utilization of g-C 3 N 4 as ETL in perovskite solar cells enhances significantly both the performance and the long-term stability. In a following study, Liu et al [ 102 ] also used graphitic carbon nitride quantum dots (g-CNQDs) as modifying reagent at the SnO 2 /perovskite interface ( Figure 9 b). The g-CNQDs were synthesized by a heat treatment of urea and sodium citrate.…”

“…( b ) Schematic illustration of the PSCs with g-CNQD modified SnO 2 layers, and top-view SEM images of perovskite films based on ( c ) SnO 2 and ( d ) SnO 2 /g-CNQD ETL. Reproduced with permission from [ 102 ], Copyright 2020, The Royal Society of Chemistry.…”

Interfacial Engineering via Self‐Assembled Thiol Silane for High Efficiency and Stability Perovskite Solar Cells

“…To commercialize the PSCs, many methods have been researched to promote the efficiency and stability, such as the preparation process of perovskite, structure design of device, composition engineering, and interfacial modification. [ 6,10,13–18 ] Among others, interfacial engineering on the surface of SnO 2 ETL has been certified to be an effective means to enhance device performance and stability by promoting electrons extraction, reducing the trap density, restraining carrier recombination, preventing current leakage, and adjusting the crystal growth of perovskite absorber. [ 19–21 ] Recently, a range of materials were introduced on SnO 2 ELT, including organic molecules, quantum dots, zwitterionic compounds, inorganic compounds, and ionic liquids.…”

“…[ 19–21 ] Recently, a range of materials were introduced on SnO 2 ELT, including organic molecules, quantum dots, zwitterionic compounds, inorganic compounds, and ionic liquids. [ 17,22–26 ] These modifications can control the electronic properties of SnO 2 , engineer bad edge of ETL and passivate SnO 2 /perovskite interface, which can noticeably promote the PCE and stability of PSCs. [ 27 ] Among others, self‐assembled monolayers (SAMs), as 2D materials with only one or a few molecules thick, were widely implemented in PSC interfaces that could promote the crystal quality of perovskite absorber, enhance the extraction of photogenerated carrier, reduce or eliminate device hysteresis, and passivate surface state of ETL or perovskite layer.…”