Zinc ion functional doping strategy is successfully introduced to promote the device efficiency and stability of the all-inorganic planar CsPbIBr2 perovskite solar cells.
The pursuit of high power conversion efficiency (PCE) and cost‐effective perovskite solar cells (PSCs) has spawned many innovative device structure designs. Compared with the traditional NIP type PSCs, electron transport layer (ETL) free PSCs have attracted growing attention due to their enormous potential in large area, low‐cost flexible application. However, there is still a lack of in‐depth understanding of the energy level arrangement indium tin oxide (ITO)/perovskite interface, resulting in poor device performance. Here, a metal/insulator/n‐type perovskite/p‐type spiro‐MeOTAD (MINP) structure is proposed to elaborate on the influence of the apparent work function and contact barrier change of the metal–semiconductor (MS) and metal–insulator–semiconductor (MIS) junction on the carrier transfer and collection. Common and easily available 5‐amino‐valeric acid is inserted into the ITO/perovskite interface to form an insulating dipole layer and to ensure quasi‐ohmic contact at the front interface. Consequently, the device changes from Schottky/PN cascade heterojunction type to a single PN heterojunction device with its ideal factor decreasing from 3.35 to 2.05. Accordingly, the champion device achieves 19.37% PCE with significantly increased Voc and FF compared to the pristine device. This work provides a facile and effective method to improve the application potential of novel ETL‐free PSCs.
With
their excellent optoelectronic properties, halide perovskite
(HP) semiconductors have witnessed successful applications in many
fields, such as solar cells, LEDs, photodetectors, transistors, and
memristors. Exploiting their fascinating physical nature for the development
of single nanodevices with multifunctionalities is significant yet
remains challenging. We report a multifunctional device based on the
n-perovskite/p-spiro-MeOTAD p–n heterojunction diode that enables
the integration of photovoltaic, photodetection, and photosynaptic
functions in a single device. The device exhibits a high photoelectronic
conversion efficiency (PCE) of 17.64% under AM 1.5G illumination and
excellent photodetection characteristics including a low drive voltage
of 0.01 V, a short response time of 0.17 s, high switching repeatability,
and stability. Coupled with the superior photomemristive effect of
the device that can be used for the emulation of short- and long-term
memory formation of visual synapses, these results suggest that the
HP-based p–n heterojunction devices hold great potential in
multifunctional integrated device applications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.