Organic-inorganic hybrid solar cell

An organic-inorganic hybrid solar cell comprising:

• a first electrode;
• a first light absorbing layer provided on the first electrode;
• a second light absorbing layer provided on the first light absorbing layer;
• and
• a second electrode provided on the second light absorbing layer,
• wherein the first light absorbing layer and the second light absorbing layer have different phase transition temperatures, and
• one of the first light absorbing layer and the second light absorbing layer comprises a compound having a perovskite structure represented by the following Chemical Formula 1 and the other comprises a compound having a perovskite structure represented by the following Chemical Formula 2:
• AMX3 [Chemical Formula 1]
• ByB′(1-y)M′X′zX″(3-z) [Chemical Formula 2]
• In Chemical Formula 1 or Chemical Formula 2,
• B and B′ are different from each other, A and B are the same as each other, and A, B, and B′ are each independently a monovalent cation selected from CnH2n+1NH3+, NH4+, HC(NH2)2+, CS+, NF4+, NCl4+, PF4+, PCl4+,CH3PH3+, CH3AsH3+, CH3SbH3+, PH4+, AsH4+, and SbH4+,
• M and M′ are the same as or different from each other, and are each independently a divalent metal ion selected from Cu2+, Ni2+, Co2+, Fe2+, Mn2+, Cr2+, Pd2+, Cd2+, Ge2+, Sn2+, Pb2+, and Yb2+,
• X, X′, and X″ are the same as or different from each other, and are each independently a halogen ion,
• n is an integer from 1 to 9,
• 0<y<1, and
• 0<z<3,
• wherein the phase transition temperature of the light absorbing layer comprising the compound having the perovskite structure of Chemical Formula 1 is higher by 20° C. to 50° C. than that of the light absorbing layer comprising the compound having the perovskite structure of Chemical Formula 2, and
• wherein an energy conversion efficiency of the organic-inorganic hybrid solar cell is at least 80% after storage for 200 hours.