Boosted charge extraction of NbO_x-enveloped SnO₂ nanocrystals enables 24% efficient planar perovskite solar cells

Abstract

Planar perovskite solar cells (PSCs) have attracted extensive research attention owing to their simple architecture and manufacturing process. Improving the charge extraction ability of the electron transport materials (ETMs) is...

5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

“…After continuous irradiation for 400 s, the PCE of the modified device decreased slowly, indicating that the photostability of PSCs modified based on indole and Cl‐indole has been improved. [ 3 ] In addition, the long‐term stability of the PSCs was tested as well. In Figure 5f, we stored all devices at 30 °C and 40% relative humidity (RH) for 30 days.…”

“…The extremely high photoelectric conversion efficiency (PCE) of perovskite solar cells (PSC) makes it attractive to photovoltaic workers. [1][2][3][4][5][6] The theoretical ShockleyÀQueisser limit efficiency is 30.5%, [7] but the current maximum efficiency of PSCs (25.5%) [2] has not yet been reached. As one of the important components of PSCs, the electron transport layer (ETL) often uses TiO 2 .…”

“…Interface engineering has been affirmed to be one of the useful methods to obtain better stability and efficiency by reducing defect states and restraining nonradiative recombination at the interface. [3,13,[17][18][19][20][21][22] For instance, Yang and colleagues introduced compounds with different functional groups on the surface of SnO 2 to make chemical interactions with the perovskite light-absorbing layer (LAL). They verified that appropriate interfacial interaction can considerably diminish the density of trap states and boost interfacial charge transfer.…”

Facile, Real‐Time Identification of Blood Components with Self‐Powered Organic–Inorganic Heterostructure Photodetectors

“…[27] The low R tr value is beneficial for carrier extraction while high R rec value is advantageous for the charge extraction in dark state. [27,28] Equivalent circuit parameters were summarized in Table S1, Supporting Information. In dark condition, R tr and R rec values were increased by widening film thickness and depletion width until moderate thickness, while immoderately increased SnO 2 QDs region showed decreased resistance values due to excessive electrons (negatively charged carriers) in n-type region.…”

Methodologies for >30% Efficient Perovskite Solar Cells via Enhancement of Voltage and Fill Factor

“…[16] J SC can maintain over 26 mA cm À2 when the replacement ratio of other cations for FA þ is less than 5%. [1,16,30] It is found obviously from Table 1 that J SC s are reduced from over 26 to 24-26 mA cm À2 when the substitution ratio is larger than 5% [32,[45][46][47][48][49][50] mainly due to the enlarged bandgaps. To further stabilize the black phase and improve film quality, Br À was incorporated to the FA-based mixed-cation perovskites to form (FAPbI 3 ) 1Àx (MAPbBr 3 ) x .…”