Method for preparing a bonded type perovskite solar cell

1. A method for preparing a bonded type perovskite solar cell, comprising:

laminating an electron transport layer, a light absorption layer, and a first hole transport layer on a transparent electrode by a non-deposition process to provide a first substrate;

forming a second hole transport layer on an opposing electrode by a non-deposition process to provide a second substrate; and

bonding the first substrate and the second substrate to contact the first hole transport layer and the second hole transport layer,

wherein the first hole transport layer is formed by coating a solution including a hole conductor and a first solvent on the light absorbing layer,

wherein the second hole transport layer is formed by coating a solution including a hole conductor and a second solvent on the opposing electrode, and

wherein the bonding is performed while the first hole transport layer is in a semi-dried state.

2. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the light absorbing layer is formed of a compound having a perovskite structure having a chemical formula AMX 3 , wherein:

A is a monovalent cationic metal ion, a monovalent organic ammonium ion, or a mixture thereof,

M is a divalent metal ion, and

X is a halogen ion.

3. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the first solvent satisfies at least one of the following conditions (a) to (c):

(a) a boiling point of the first solvent is higher than a boiling point of the second solvent;

(b) a vapor pressure of the first solvent is lower than a vapor pressure of the second solvent; and

(c) a volatility of the first solvent is lower than a volatility of the second solvent.

4. The method for preparing a bonded type perovskite solar cell of claim 3 , wherein the second solvent is at least one of toluene, benzene, or methylethyl ketone, and

wherein the first solvent is at least one of dichlorobenzene, chlorobenzene, or xylene.

5. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the bonding is performed while the second hole transport layer is in a semi-dried state.

6. The method for preparing a bonded type perovskite solar cell of claim 5 , wherein the second solvent satisfies at least one of the following conditions (a) to (c):

(a) a boiling point of the second solvent is higher than a boiling point of the first solvent;

(b) a vapor pressure of the second solvent is lower than a vapor pressure of the first solvent; and

(c) a volatility of the second solvent is lower than a volatility of the first solvent.

7. The method for preparing a bonded type perovskite solar cell of claim 6 , wherein the first solvent is at least one of toluene, benzene, or methylethyl ketone, and

wherein the second solvent is at least one of dichlorobenzene, chlorobenzene, or xylene.

8. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the hole conductor is at least one selected from a group consisting of spiro-MeOTAD(2,2′,7′-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9′spirobifluorene), P3HT(poly[3-hexylthiophene]), MDMO-PPV(poly[2-methoxy-5-(3′,7′-dimethyloctyloxyl)]-1,4-phenylene vinylene), MEH-PPV(poly[2-methoxy-5-(2″-ethylhexyloxy)-p-phenylene vinylene]), P3OT(poly(3-octylthiophene)), P3DT(poly(3-decylthiophene)), P3DDT(poly(3-dodecylthiophene)), PPV(poly(p-phenylene vinylene)), TFB(poly(9,9′-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine)), PCPDTBT(poly[2,1,3-benzothiadiazole-4,7-diyl[4,4-bis(2-ethylhexyl-4H-cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-diyl)]]), Si-PCPDTBT(poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl]), PBDTTPD(poly((4,8-diethylhexyloxyl)benzo([1,2-b:4,5-b′]dithiophene)-2,6-diyl)-alt-((5-octylthieno[3,4-c]pyrrole-4,6-dione)-1,3-diyl)), PFDTBT(poly[2,7-(9-(2-ethylhexyl)-9-hexyl-fluorene)-alt-5,5-(4′,7,-di-2-thienyl-2′,1′,3′-benzothiadiazole)]), PFO-DBT(poly[2,7-9,9-(dioctyl-fluorene)-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)]), PSiFDTBT(poly[(2,7-dioctylsilafluorene)-2,7-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,5′-diyl]), PSBTBT(poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl]), PCDTBT(poly [[9-(1-octylnonyl)-9H-carbazole-2,7-diyl]-2,5-thiophenediyl-2,1,3-benzothiadiazole-4,7-diyl-2,5-thiophenediyl]), PFB(poly(9,9′-dioctylfluorene-co-bis(N,N′-(4,butylphenyl))bis(N,N′-phenyl-1,4-phenylene)diamine), F8BT(poly(9,9′-dioctylfluorene-co-benzothiadiazole), PEDOT (poly(3,4-ethylenedioxythiophene)), PEDOT:PSS (poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)), PTAA(poly(triarylamine)), poly(4-butylphenyl-diphenyl-amine), and copolymers thereof.

9. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein, in the bonding, the first substrate and the second substrate are laminated and then dried under conditions of 10° C. to 60° C. and 10 hrs to 30 hrs in a pressurized state.

10. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the transparent electrode is formed by coating at least one of indium tin oxide, fluorine tin oxide, aluminum doped zinc oxide, indium zinc oxide, ZnO—Ga 2 O 3 , ZnO—Al 2 O 3 , or antimony tin oxide on a transparent substrate.

11. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the opposing electrode is formed by coating at least one of indium tin oxide, fluorine tin oxide, aluminum doped zinc oxide, indium zinc oxide, ZnO—Ga 2 O 3 , ZnO—Al 2 O 3 , or antimony tin oxide on a transparent substrate; or a metal electrode made of at least one metal of silver, aluminum, platinum, tungsten, copper, molybdenum, gold, nickel, or palladium.

12. The method for preparing a bonded type perovskite solar cell of claim 1 , wherein the electron transport layer is a blocking electron transport layer in which at least one of TiO 2 , SnO 2 , ZnO, WO 3 , Nb 2 O 5 , or TiSrO 3 is formed on the transparent electrode in a thin film form.

13. The method for preparing a bonded type perovskite solar cell of claim 12 , wherein the electron transport layer further comprises a porous electron transport layer formed by coating a paste including at least one of TiO 2 , SnO 2 , ZnO, WO 3 , Nb 2 O 5 , or TiSrO 3 on the blocking electron transport layer.