- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Cesium carbonate modified electron transport layer for improving the photoelectric conversion efficiency of planar perovskite solar cells
摘要： TiO2 is a commonly used material in the electron transport layers (ETLs) of perovskite solar cells (PSCs) but its defects restrict the development of PSCs. In this study, cesium carbonate (Cs2CO3) was used to modify the TiO2 ETLs because of its excellent electron injection ability. The new structure of the PSC was FTO/TiO2/Cs2CO3/perovskite (MAPbI3)/sprio-OMETAD/back electrode. As expected, adding Cs2CO3 increased the champion photoelectric conversion efficiency (PCE) from 9.2% to 12.8% in comparison with unmodified solar cells, and the device maintained 78% of the original efficiency after 250 h. Moreover, the reduction of defects in the TiO2 ETLs reduced the coincidence probability of carriers after modification with Cs2CO3. Due to the excellent electron injection ability of Cs2CO3, the modified ETLs yielded lower work functions and smaller energy level barriers, which makes the energy levels between the TiO2 ETL and the MAPbI3 layer well-matched, and reduced the carrier coincidence probability.
关键词： Cs2CO3,Perovskite solar cells,Electron transport layers,Interface modification
更新于2025-09-19 17:13:59
-
Improved open-circuit voltage via Cs2CO3-Doped TiO2 for high-performance and stable perovskite solar cells
摘要： Organic-inorganic metal halide perovskites have drawn the interest of scientific community due to their suitable optoelectronic properties and high solar cell efficiency. In this report, we demonstrated, for the first time, the application of Cs2CO3 - doped TiO2 as an efficient electron-transporting layer (ETL) in PSCs. Remarkably, the optimized Cs2CO3-doped TiO2 films exhibited improved wetting properties which assisted the deposition of perovskite films and improved the TiO2 / perovskite interface by lowering the work function. With X-ray diffraction studies, better crystalline of the perovskite films could be found in the doped devices. Solar cells prepared with the Cs2CO3-doped TiO2 as ETL resulted in a 19% efficiency performance and improved stability.
关键词： Electron-transporting,TiO2,Perovskite solar cells,Stability,Cs2CO3
更新于2025-09-16 10:30:52
-
Highly flexible and solution-processed organic photodiodes and their application to optical luminescent oxygen sensors
摘要： We present a solution-processed flexible organic photodiode (f-OPD) with a bulk heterojunction (BHJ) structure based on a blend of poly (3-hexylthiophene-2,5-diyl) and 1-(3-methoxycarbonyl) propyl-1-phenyl[6,6]C61 (P3HT:PCBM). We used Cs2CO3-doped polyethyleneimine ethoxylated (d-PEIE) as the electron transport layer (ETL) material, which significantly improved the electron injection properties of the f-OPD. Compared with f-OPDs with conventional ETL materials such as Cs2CO3, the external quantum efficiency (EQE) of the d-PEIE-based f-OPD was highly improved. Analytical results showed that the d-PEIE reduced the work function of the cathode, thereby facilitating the efficiency of electron injection from the active layer (AL) to the cathode of the f-OPD. In addition, after 10,000 cycles of tensile bending at a bending radius of 5 mm, the normalized ID variation (ID/ID0) in the d-PEIE-based f-OPD remained above 90%, indicating an excellent device bending stability. Finally, f-OPD-based luminescent oxygen (O2) sensors were successfully fabricated consisting of a photoluminescent O2 sensing film, a light source, and an f-OPD. The O2 sensors based on d-PEIE-based f-OPDs showed the highest photocurrent and O2 sensitivity in relation to the O2 concentration compared with O2 sensors based on f-OPDs with conventional ETL materials.
关键词： organic photodiodes,electron transport layer,Cs2CO3,polyethyleneimine ethoxylated
更新于2025-09-10 09:29:36