Stepping toward Portable Optoelectronics with SnO₂ Quantum Dot-Based Electron Transport Layers

Abstract

With a power conversion efficiency (PCE) of more than 25%, perovskite solar cells (PSCs) have shown an immense potential application for solar energy conversion. Owing to lower manufacturing costs and facile processibility via printing techniques, PSCs can easily be scaled up to an industrial scale. The device performance of printed PSCs has been improving steadily with the development and optimization of the printing process for the device functional layers. Various kinds of SnO2 nanoparticle (NP) dispersion solutions including commercial ones are used to print the electron transport layer (ETL) of printed PSCs, and high processing temperatures are often required to obtain ETLs with optimum quality. This, however, limits the application of SnO2 ETLs in printed and flexible PSCs. In this work, the use of an alternative SnO2 dispersion solution based on SnO2 quantum dots (QDs) to fabricate ETLs of printed PSCs on flexible substrates is reported. A comparative analysis of the performance and properties of the obtained devices with the devices fabricated employing ETLs made with a commercial SnO2 NP dispersion solution is carried out. The ETLs made with SnO2 QDs are shown to improve the performance of devices by ∼11% on average compared to the ETLs made with SnO2 NPs. It is found that employing SnO2 QDs can reduce trap states in the perovskite layer and improve charge extraction in devices.

Self-Powered Printed Flexible Bifacial Perovskite Photodetector

“…SnO 2 quantum dots ink was prepared in accordance with our previous studies. , Perovskite ink was prepared by dissolving 1 mol of MAI and PbI 2 in 700 μL of MA using a hot plate at 70 °C and a stirring speed of 460 rpm for 1 h. The final MAPbI 3 ink was obtained by addition of 700 μL of ACN and stirring at room temperature for 3 more hours. Lastly, Spiro-OMeTAD ink was prepared by dissolving 45 mg of Spiro-OMeTAD in 1 mL of CB.…”

Impact of a Short‐Pulse High‐Intense Proton Irradiation on High‐Performance Perovskite Solar Cells

“…The electrical contacts are the Au and FTO layers. Based on the work functions of the material, [4,39] the energy diagram is depicted in Figure 2b. The scanning electron microscopy (SEM) image Figure 2c of the PSC cross-section demonstrates all functional layers of the device.…”

“…Perovskites are rapidly developing materials widely used in optoelectronics. [1][2][3][4] Their high absorption coefficient, optimal bandgap, low exciton binding energy, and tolerance to defects have enabled perovskite solar cells (PSCs) to rapidly achieve a record efficiency of 26.1%. [5][6][7] At the same time, PSCs offer environmentally friendly and cost-effective approaches compared to classical semiconductors due to their solution-processed Such an environmentally stable PSC can be used in space applications if it endures an extreme radiation atmosphere without any further engineering, additional cost, and performance negotiation.…”