Leadfreeorganicinorganictin
halideperovskitesfor
photovoltaicapplications
Noel, N., Stranks, S.,
AbateA.,et.al
PublishedMay1,2014
In the previous report, the goal is to changed
CH3NH3PbI3toCH3NH3SnCl3
Basedonthearticle:
TinmostsuitabletochangeLeadbutithas
Ex 1.1-1
According to optimal control theory,
( f + g ) = 0
f = n1 d 1 sec 1 + n 2 d 2 sec 2
The constraint
g = d 1 tan 1 + d 2 tan 2 d
Thus
( f + g ) = n1 d 1 sec 1 tan 1 + n 2 d 2 sec 2 tan 2 + (d 1 sec 2 1 + d 2 sec 2 2 ) = 0
n1 d 1 sec 1 tan 1 + d 1 s
Answer for HOMEWORK 1
Ex1.1-1
Optical Path Length = n1 d1 sec 1 + n 2 d 2 sec 2 = w (1)
Restrict Condition = d1 tan 1 + d 2 tan 2 = L (2)
Find the minimum for OPL, so we differential the (1),(2) with 1 ,
d
dw
= n1 d1 sec 1 tan 1 + n2 d 2 sec 2 tan 2 2 = 0