Novel compound, and composition for forming hole transporting layer for perovskite solar cells

A hole transport layer forming composition for perovskite solar cells comprising a compound represented by formula (VIII) and a solvent and comprising no dopant:

• wherein, in formula (VIII), Ar is an aryl group, and wherein when Ar comprises a plurality of aromatic rings, A may be bonded to a plurality of aromatic rings;
• A is represented by formula (II);
• Z is hydrogen, a structure represented by formula (III) or a structure represented by formula (IV), which may be the same or different from each other, wherein all of Z is not hydrogen;
• wherein, in formula (III), Y is at least one species independently selected from:
• wherein R1 and R2 are independently hydrogen, alkyl, or alkoxy, or R1 and R2 are combined to form a ring having one or two oxygen atoms
• X is alkyl, alkoxy, alkylthio, monoalkylamino or dialkylamino, which may be independently substituted with halogen, respectively;
• k is 0 or 1, l is 2 or 3, m is an integer from 1 to 6, and r is 1 or 2, wherein when k is 0, l is 3, and m is 1, such that A has three bonds with Z;
• and
• wherein the compound represented by formula (VIII) is not any of those compounds listed below:

Perovskite solar cells having a hole transport layer comprising a compound represented by formula (VIII):

• wherein, in formula (VIII),
• Ar is an aryl group, and wherein when Ar comprises a plurality of aromatic rings, A may be bonded to a plurality of aromatic rings;
• A is represented by formula (II):
• Z is hydrogen, a structure represented by formula (III) or a structure represented by formula (IV), which may be the same or different from each other, wherein all of Z is not hydrogen;
• wherein, in formula (III), Y is at least one species independently selected from:
• wherein R1 and R2 are independently hydrogen, alkyl, or alkoxy, or R1 and R2 are combined to form a ring having one or two oxygen atoms;
• X is alkyl, alkoxy group, alkylthio, monoalkylamino or dialkylamino, which may be independently substituted with halogen, respectively;
• k is 0 or 1, l is 2 or 3, m is an integer from 1 to 6, and r is 1 or 2, wherein when k is 0, l is 3, and m is 1, such that A has three bonds with Z;
• and
• wherein the compound represented by formula (VIII) is not any of those compounds listed below:

Use of a compound represented by formula (VIII), for the manufacture of perovskite solar cells:

• wherein, in formula (VIII), Ar is an aryl group, and wherein when Ar comprises a plurality of aromatic rings, A may be bonded to a plurality of aromatic rings;
• A is represented by formula (II):
• Z is hydrogen, a structure represented by formula (III) or a structure represented by formula (IV), which may be the same or different from each other, wherein all of Z is not hydrogen,
• wherein, in formula (III), Y is at least one species independently selected from:
• wherein R1 and R2 are independently hydrogen, alkyl, or alkoxy, or R1 and R2 are combined to form a ring having one or two oxygen atoms;
• X is alkyl, alkoxy, alkylthio, monoalkylamino or dialkylamino, which may be independently substituted with halogen, respectively;
• k is 0 or 1, l is 2 or 3, m is an integer from 1 to 6, and r is 1 or 2, wherein when k is 0, l is 3, and m is 1, such that A has three bonds with Z;
• and
• wherein the compound according to formula (VIII) is not any of those compounds listed below:

Use of a compound represented by formula (VIII), for the manufacture of a hole transport layer in perovskite solar cells:

• wherein, in formula (VIII),
• Ar is an aryl group, and wherein when Ar comprises a plurality of aromatic rings, A may be bonded to a plurality of aromatic rings;
• A is represented by formula (II):
• Z is hydrogen, a structure represented by formula (III), or a structure represented by formula (IV), which may be the same or different from each other, wherein all of Z is not hydrogen;
• wherein, in formula (III), Y is at least one species independently selected from:
• wherein R1 and R2 are independently hydrogen, alkyl, or alkoxy, or R1 and R2 are combined to form a ring having one or two oxygen atoms;
• X is alkyl, alkoxy, alkylthio, monoalkylamino or dialkylamino, which may be independently substituted with halogen, respectively;
• k is 0 or 1, l is 2 or 3, m is an integer from 1 to 6, and r is 1 or 2, wherein when k is 0, l is 3, and m is 1, such that A has three bonds with Z;
• and
• wherein the compound according to formula (VIII) is any of those compounds listed below: