Carrier Mobility of Bismuth-Doped Perovskite

As renewable energy increasingly becomes a priority around the world, the demand for inexpensive, efficient solar cells is greater than ever. Lead halide perovskites show promising potential, but have their share of drawbacks that could be improved through slight changes to its elemental composition. We used time-resolved terahertz spectroscopy to probe the differences created by doping lead halide perovskites with bismuth. We found that all samples, regardless of bismuth content, had a recombination time longer than one nanosecond, and that charge-carrier mobility decreased with the addition of bismuth

The theatre and drama as reflected in the development of the informal essay

Thesis (M.A.)--Boston Universit

Measuring the Hubble Constant with the Hubble Space Telescope

Ten years ago our team completed the Hubble Space Telescope Key Project on the extragalactic distance scale. Cepheids were detected in some 25 galaxies and used to calibrate four secondary distance indicators that reach out into the expansion field beyond the noise of galaxy peculiar velocities. The result was H_0 = 72 +/- 8 km/sec/Mpc and put an end to galaxy distances uncertain by a factor of two. This work has been awarded the Gruber Prize in Cosmology for 2009.Comment: Gruber Prize Lecture to be published in Transactions of the IA

A bank examiner looks at agricultural lending

Agricultural credit ; Bank loans

Lepidophyma gaigeae

Number of Pages: 4Integrative BiologyGeological Science

Leptodactylus bufonius

Number of Pages: 22Integrative BiologyGeological Science

Land Grant Application- Leavitt, William (Alfred)

Land grant application submitted to the Maine Land Office on behalf of William Leavitt for service in the Revolutionary War, by their widow Betsy.https://digitalmaine.com/revolutionary_war_me_land_office/1553/thumbnail.jp