| 主权项 |
1. A solar cell, comprising:
a first electrode; a second electrode; and a first conversion layer disposed between the first electrode and the second electrode, and the first electrode being closer to a light incident side than the second electrode, wherein the first conversion layer is a composition-gradient perovskite, a part of the first conversion layer adjacent to the first electrode has an energy gap lower than that of a part of the first conversion layer adjacent to the second electrode, and the first conversion layer has a composition of M1mM2(1−m)A[X1xX2(1−x)]3,
wherein each of M1 and M2 is independently a divalent cation of Ge, Sn, or Pb,wherein A is a monovalent cation of methylammonium, ethylammonium, or formamidinium,wherein each of X1 and X2 is independently a monovalent anion of halogen,wherein M1 has a lower atomic number than M2, X1 has a higher atomic number than X2, or a combination thereof;wherein 1≧m≧0, 1≧x≧0, and the m and x are greater at a location that is closer to the first electrode. |
