Photovoltaic cells incorporating the compounds A/M/X compounds as hole transport materials are provide. The A/M/X compounds comprise one or more A moieties, one or more M atoms and one or more X atoms. The A moieties are selected from organic cations and elements from Group 1 of the periodic table, the M atoms are selected from elements from at least one of Groups 3, 4, 5, 13, 14 or 15 of the periodic table, and the X atoms are selected from elements from Group 17 of the periodic table.
REFERENCE TO GOVERNMENT RIGHTS
 This invention was made with government support under DE-FG02-08ER46536, DE-SC0001059 awarded by the Department of Energy, and DMR0843962 and ESI0426328 awarded by the National Science Foundation. The government has certain rights in the invention.