# US 2017/0288159 A1 · Electron transport layer for flexible perovskite solar cell and flexible perovskite solar cell including the same

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2017/0288159 A1
- Document ID: US20170288159A1
- Status: Published application
- Kind: A1
- Application number: 15/402,464
- Filed: 2017-01-10
- Published: 2017-10-05
- Earliest claimed: 2016-04-01
- Assignees: Korea Institute of Science and Technology
- Applicants: Korea Institute of Science and Technology
- Inventors: Min Jae KO; Jin JOO; Hae Jung SON; Jai Kyeong KIM; Doh-Kwon LEE; Inyoung JEONG
- Web page: https://patentgrep.com/patent/US20170288159A1

## CPC

- H10K 30/151: {the wide bandgap semiconductor comprising titanium oxide, e.g. TiO2}
- H10K 85/50: Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3
- H10K 30/50: Photovoltaic [PV] devices
- H10K 77/111: {Flexible substrates}
- Y02E 10/549: Organic PV cells
- H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed is an electron transport layer for a flexible perovskite solar cell. The electron transport layer includes transition metal-doped titanium dioxide particles. The titanium dioxide particles are densely packed in the electron transport layer. The electron transport layer is transparent. The use of the electron transport layer enables the fabrication of a flexible perovskite solar cell with high power conversion efficiency. Also disclosed is a flexible perovskite solar cell employing the electron transport layer.

## Claims

### Claim 1

A method for preparing an electron transport layer for a flexible perovskite solar cell, comprising (A) mixing a titanium precursor, a transition metal precursor, and an organic ligand to prepare transition metal-doped titanium dioxide particles and (B) irradiating the transition metal-doped titanium dioxide particles with UV.

### Claim 2 (depends on 1)

The method according to claim 1, wherein, in step (A), the transition metal precursor is selected from the group consisting of scandium (III) triflate, yttrium borate, yttrium acetate hydrate, lanthanum nitrate, niobium ethoxide isopropoxide, niobium alkoxides, ammonium metavanadate, tantalum ethoxide, and mixtures thereof.

### Claim 3 (depends on 1)

The method according to claim 1, wherein, in step (A), the transition metal precursor is used in an amount of 1 to 5 mol %, based on the total weight of the mixture of the titanium precursor, the transition metal precursor, and the organic ligand.

### Claim 4 (depends on 1)

The method according to claim 1, wherein, in step (A), the titanium precursor and the organic ligand are mixed in a molar ratio of 1:2-5.

### Claim 5 (depends on 1)

The method according to claim 1, wherein, in step (A), the mixture of the titanium precursor, the transition metal precursor, and the organic ligand is heated at 250 to 300° C. for 1 to 3 hours.

### Claim 6 (depends on 1)

The method according to claim 1, wherein, in step (B), the transition metal-doped titanium dioxide particles are irradiated with UV for 40 to 120 minutes.