Suppressing Charge Recombination and Ultraviolet Light Degradation of Perovskite Solar Cells Using Silicon Oxide Passivation

Abstract

Organic‐metal lead halide perovskite solar cells (PSCs) featuring low‐cost and high efficiency have been recognized as promising photovoltaic devices, but their serious charge recombination and ultraviolet light irradiation instability limit their output efficiency and long‐term operation. In this work, we have introduced silicon oxide as an interfacial modifier of the electron transporting layer in TiO2‐based planar heterojunction PSCs. The incorporation of a silicon oxide modifier passivates the trap states of perovskite absorber and suppresses the charge recombination of PSCs. As a consequence, a competitive solar‐to‐electricity conversion efficiency of 18.0 % was achieved for the device fabricated with the silicon‐oxide‐modified TiO2 electron extraction layer, which is increased by 15 % compared with the PSC fabricated with pristine TiO2; this can be attributed to the significantly increased open‐circuit voltage and photocurrent density. Furthermore, the ultraviolet light irradiation stability of PSCs is greatly improved, resulting from the low photocatalytic activity of the silicon‐oxide‐modified TiO2 electron transporting layer, as revealed by the photoelectrochemical oxidation of CH3NH2. This work represents a feasible step through interfacial engineering toward the realization of ultraviolet‐light‐stable and scalable PSCs.

A Two‐Step Modified Sequential Deposition Method‐based Pb‐Free (CH3NH3)3Sb2I9 Perovskite with Improved Open Circuit Voltage and Performance

“…prepared a mixed halide Pb based perovskite and the developed perovskite solar cells (PSCs) device exhibited an highest PCE of 19.33 % and highest PCE of 23 % was certified by NREL . However, in general low stability and highly toxic nature of Pb restricted production at large scale for commercialization . Thus, Hou et al .…”

“…employed Fe 2 O 3 /PCBM electron transport layer and the fabricated device showed the improved stability with interesting PCE of 14 % . This suggested that the stability could be improved by introducing some novel electron transport/charge extraction layers but the presence of Pb remains a challenge . In this regard, tin (Sn) was introduced as a suitable replacement for Pb due to its similar valency, ionic radii and less toxicity .…”

“…[8] However, in general low stability and highly toxic nature of Pb restricted production at large scale for commercialization. [9][10][11][12][13] Thus, Hou et al employed Fe 2 O 3 /PCBM electron transport layer and the fabricated device showed the improved stability with interesting PCE of 14 %. [14] This suggested that the stability could be improved by introducing some novel electron transport/charge extraction layers but the presence of Pb remains a challenge.…”

“…[14] This suggested that the stability could be improved by introducing some novel electron transport/charge extraction layers but the presence of Pb remains a challenge. [13] In this regard, tin (Sn) was introduced as a suitable replacement for Pb due to its similar valency, ionic radii and less toxicity. [15] Therefore, Snaith and co-workers have investigated the optoelectronic properties of CH 3 NH 3 SnI 3 perovskite and employed it as light absorber.…”

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

“…With the rapid development of industry, materials, energy, printing and agriculture, a large amount of sewage and other pollutants is directly discharged without being purified or purification treatment . This fails to meet the discharge standards and causes severe damages to the water environment.…”