Simultaneous band-gap narrowing and carrier-lifetime prolongation of organic-inorganic trihalide perovskites.
Proc Natl Acad Sci U S A
; 113(32): 8910-5, 2016 08 09.
Article
em En
| MEDLINE
| ID: mdl-27444014
ABSTRACT
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 â¼100% increase) under mild pressures at â¼0.3 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.
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01-internacional
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MEDLINE
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En
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Proc Natl Acad Sci U S A
Ano de publicação:
2016
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Article