Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > CsPbBrI2 perovskites with low energy loss for high-performance indoor and outdoor photovoltaics

Schematic diagram of device structure and secondary grain growth with (NH4)2C2O4* H2O treatment.

CREDIT
İScience China Press
Schematic diagram of device structure and secondary grain growth with (NH4)2C2O4* H2O treatment. CREDIT İScience China Press

Abstract:
Over the years, the efficiency of PSCs has increased at an unprecedented pace. However, many reports have revealed significant irreversible decomposition of the organic component under high humidity and high temperature conditions, implying the instability of organic-inorganic hybrid perovskite solar cell in real applications. Normally, inorganic materials exhibit better stability compared to organic materials, especially at elevated temperatures. However, the size of the Cs+ cation is too small to hold the PbI62? octahedron. Therefore, the photoactive α-phase (cubic phase) is unstable and the CsPbBrI2 and CsPbI3 materials easily convert to the undesired δ-phase (orthorhombic phase) at room temperature. In addition, a main limiting factor in the photoelectric performance of all-inorganic PSCs is the energy loss (a large Eloss ca. 0.7 to 0.9 eV). In brief, a large Eloss reflects inhomogeneous energy landscape, large trap density and significant energy disorder in the device, which generate a nonradiative energy loss channel and a Voc reduction. Therefore, enhancing the Voc to reduce Eloss is crucial for high performance in all-inorganic PSCs.

CsPbBrI2 perovskites with low energy loss for high-performance indoor and outdoor photovoltaics

Beijing, China | Posted on December 1st, 2020

Generally, Voc is related to the band gap of perovskite, the highest occupied molecular orbital (HOMO) of the hole-transporting layer (HTL) and the lowest unoccupied molecular orbital (LUMO) of the electron-transporting layer (ETL). Meanwhile, the Voc of devices is also related to the quality of film (grain size). Such as, Kim et al. analyzed an intensity-dependent Voc on the basis of Shockley-Read-Hall (SRH) model and confirmed that decrease in grain size is accompanied by a downturn in optoelectronic performance of PSCs, due to the increase in trap density.

In this work, we demonstrate a secondary grain growth functionalization with ammonium oxalate ((NH4)2C2O4* H2O) to improve the optoelectronic performance of all-inorganic PSCs, wherein (NH4)2C2O4* H2O can effectively promote the secondary growth of the perovskite crystal to a few microns. The resulting high-quality perovskite film exhibited higher carrier mobility and lower trap density and eventually achieved ultra-low energy loss (0.64 eV). The CsPbBrI2:(NH4)2C2O4* H2O-based device exhibits a highest Voc of 1.24 V and PCE of 16.55% under AM 1.5 G, and a record PCE is 28.48% under under a fluorescent lamp of 1000 lux.

###

This project is also funded by the Collaborative Innovation Center of Suzhou Nano Science and Technology, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the "111" Project of The State Administration of Foreign Experts Affairs of China), and the Open Fund of the State Key Laboratory of Integrated Optoelectronics (IOSKL2018KF07).

####

For more information, please click here

Contacts:
Zhao-Kui Wang

Copyright © Science China Press

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

See the article:

Related News Press

News and information

New technique builds super-hard metals from nanoparticles January 22nd, 2021

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Researchers develop new graphene nanochannel water filters January 22nd, 2021

Pioneering new technique could revolutionise super-resolution imaging systems January 22nd, 2021

Perovskites

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Govt.-Legislation/Regulation/Funding/Policy

New technique builds super-hard metals from nanoparticles January 22nd, 2021

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Researchers develop new graphene nanochannel water filters January 22nd, 2021

Bringing Atoms to a Standstill: NIST Miniaturizes Laser Cooling January January 21st, 2021

Possible Futures

New technique builds super-hard metals from nanoparticles January 22nd, 2021

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Researchers develop new graphene nanochannel water filters January 22nd, 2021

Pioneering new technique could revolutionise super-resolution imaging systems January 22nd, 2021

Discoveries

New technique builds super-hard metals from nanoparticles January 22nd, 2021

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Researchers develop new graphene nanochannel water filters January 22nd, 2021

Pioneering new technique could revolutionise super-resolution imaging systems January 22nd, 2021

Announcements

New technique builds super-hard metals from nanoparticles January 22nd, 2021

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Researchers develop new graphene nanochannel water filters January 22nd, 2021

Pioneering new technique could revolutionise super-resolution imaging systems January 22nd, 2021

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

New technique builds super-hard metals from nanoparticles January 22nd, 2021

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

Researchers develop new graphene nanochannel water filters January 22nd, 2021

Pioneering new technique could revolutionise super-resolution imaging systems January 22nd, 2021

Energy

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Controlling the nanoscale structure of membranes is key for clean water, researchers find January 1st, 2021

Bionic idea boosts lithium-ion extraction January 1st, 2021

Solar/Photovoltaic

Squeezing a rock-star material could make it stable enough for solar cells: A promising lead halide perovskite is great at converting sunlight to electricity, but it breaks down at room temperature; now scientists have discovered how to stabilize it with pressure from a diamond a January 22nd, 2021

USTC develops ultrahigh-performance plasmonic metal-oxide materials January 11th, 2021

Engineers find antioxidants improve nanoscale visualization of polymers January 8th, 2021

Nanomaterials researchers in Finland, the United States and China have created a color atlas for 466 unique varieties of single-walled carbon nanotubes. December 14th, 2020

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project