Stability

Stability progress ?  Was this test an unsealed device ? Open to the air ?

https://www.sciencedaily.com/releases/2018/02/180226103347.htm


Preliminary tests of the prowess of their device using these perovskites device architecture revealed a 19.10 percent (±1 percent) power conversion efficiency. The current density of the device was almost 23 milliamps per square centimeter and it could generate 1.076 Volts. Importantly, the device could sustain four-fifths of this level of efficiency in use for around five months.
Preliminary tests of the prowess of their device using these perovskites device architecture revealed a 19.10 percent (±1 percent) power conversion efficiency. The current density of the device was almost 23 milliamps per square centimeter and it could generate 1.076 Volts. Importantly, the device could sustain four-fifths of this level of efficiency in use for around five months.