scholarly journals Large Band Gap Narrowing and Prolonged Carrier Lifetime of (C 4 H 9 NH 3 ) 2 PbI 4 under High Pressure

2019 ◽  
pp. 1900240 ◽  
Author(s):  
Ye Yuan ◽  
Xiao‐Fei Liu ◽  
Xuedan Ma ◽  
Xiaoli Wang ◽  
Xin Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Band Gap ◽  
Carrier Lifetime ◽  
Band Gap Narrowing

scholarly journals Simultaneous band-gap narrowing and carrier-lifetime prolongation of organic–inorganic trihalide perovskites

2016 ◽  
Vol 113 (32) ◽  
pp. 8910-8915 ◽  
Author(s):  
Lingping Kong ◽  
Gang Liu ◽  
Jue Gong ◽  
Qingyang Hu ◽  
Richard D. Schaller ◽  
...  
Keyword(s):  
Band Gap ◽  
Carrier Lifetime ◽  
Materials Science ◽  
Photovoltaic Performance ◽  
Solar Spectrum ◽  
Critical Factor ◽  
Electron Interaction ◽  
Inorganic Hybrid ◽  
Photovoltaic Materials ◽  
Band Gap Narrowing

The organic–inorganic hybrid lead trihalide perovskites have been emerging as the most attractive photovoltaic materials. As regulated by Shockley–Queisser theory, a formidable materials science challenge for improvement to the next level requires further band-gap narrowing for broader absorption in solar spectrum, while retaining or even synergistically prolonging the carrier lifetime, a critical factor responsible for attaining the near-band-gap photovoltage. Herein, by applying controllable hydrostatic pressure, we have achieved unprecedented simultaneous enhancement in both band-gap narrowing and carrier-lifetime prolongation (up to 70% to ∼100% increase) under mild pressures at ∼0.3 GPa. The pressure-induced modulation on pure hybrid perovskites without introducing any adverse chemical or thermal effect clearly demonstrates the importance of band edges on the photon–electron interaction and maps a pioneering route toward a further increase in their photovoltaic performance.

scholarly journals Crystal and electronic structure engineering of tin monoxide by external pressure

2021 ◽  
Author(s):  
Kun Li ◽  
Junjie Wang ◽  
Vladislav A. Blatov ◽  
Yutong Gong ◽  
Naoto Umezawa ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Band Gap ◽  
High Pressures ◽  
Low Pressure ◽  
Widespread Application ◽  
Space Group ◽  
Tin Monoxide ◽  
High Possibility ◽  
Pressure Phase

AbstractAlthough tin monoxide (SnO) is an interesting compound due to its p-type conductivity, a widespread application of SnO has been limited by its narrow band gap of 0.7 eV. In this work, we theoretically investigate the structural and electronic properties of several SnO phases under high pressures through employing van der Waals (vdW) functionals. Our calculations reveal that a metastable SnO (β-SnO), which possesses space group P21/c and a wide band gap of 1.9 eV, is more stable than α-SnO at pressures higher than 80 GPa. Moreover, a stable (space group P2/c) and a metastable (space group Pnma) phases of SnO appear at pressures higher than 120 GPa. Energy and topological analyses show that P2/c-SnO has a high possibility to directly transform to β-SnO at around 120 GPa. Our work also reveals that β-SnO is a necessary intermediate state between high-pressure phase Pnma-SnO and low-pressure phase α-SnO for the phase transition path Pnma-SnO →β-SnO → α-SnO. Two phase transition analyses indicate that there is a high possibility to synthesize β-SnO under high-pressure conditions and have it remain stable under normal pressure. Finally, our study reveals that the conductive property of β-SnO can be engineered in a low-pressure range (0–9 GPa) through a semiconductor-to-metal transition, while maintaining transparency in the visible light range.

Band-gap narrowing and potential fluctuation in Si-doped GaN

1999 ◽  
Vol 74 (1) ◽  
pp. 102-104 ◽  
Author(s):  
In-Hwan Lee ◽  
J. J. Lee ◽  
P. Kung ◽  
F. J. Sanchez ◽  
M. Razeghi
Keyword(s):  
Band Gap ◽  
Potential Fluctuation ◽  
Si Doped ◽  
Band Gap Narrowing

High-pressure zinc oxide phase as visible-light-active photocatalyst with narrow band gap

2017 ◽  
Vol 5 (38) ◽  
pp. 20298-20303 ◽  
Author(s):  
Hadi Razavi-Khosroshahi ◽  
Kaveh Edalati ◽  
Ji Wu ◽  
Yuki Nakashima ◽  
Makoto Arita ◽  
...  
Keyword(s):  
High Pressure ◽  
Zinc Oxide ◽  
Visible Light ◽  
Band Gap ◽  
Narrow Band ◽  
Oxide Phase ◽  
Visible Light Active

High-pressure rocksalt ZnO with a band gap of 1.8 eV, which can absorb visible light.

Sign in / Sign up

Export Citation Format

Share Document