# US 11,309,139 B2 · Bifacial light-harvesting dye-sensitized solar cell

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- Number: US 11,309,139 B2
- Document ID: US11309139B2
- Status: Granted
- Kind: B2
- Application number: 16/683,297
- Filed: 2019-11-14
- Published: 2021-03-18
- Granted: 2022-04-19
- Earliest claimed: 2019-09-16
- Assignees: National Cheng Kung University
- Applicants: National Cheng Kung University
- Inventors: Yuh-Lang Lee; I-Ping Liu; Yu-Syuan Cho
- Web page: https://patentgrep.com/patent/US11309139B2

## CPC

- H01G 9/2059: {comprising an organic dye as the active light absorbing material, e.g. adsorbed on an electrode or dissolved in solution}
- H01G 9/2022: {characterized by he counter electrode}
- H01G 9/2068: {Panels or arrays of photoelectrochemical cells, e.g. photovoltaic modules based on photoelectrochemical cells}
- H01G 9/209: {Light trapping arrangements}
- H01G 9/2031: {comprising titanium oxide, e.g. TiO2 (H01G9/2036 takes precedence)}
- Y02E 10/542: Dye sensitized solar cells
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A bifacial light-harvesting dye-sensitized solar cell is provided and has: a first transparent substrate, a second transparent substrate, a working electrode, a first semiconductor layer, a second semiconductor layer, a third semiconductor layer, a counter electrode, a light-transmitting catalyst layer, and a liquid electrolyte. A photoelectric conversion efficiency of the dye-sensitized solar cell is improved by using a specific working electrode structure.

## Claims

### Claim 1

A bifacial light-harvesting dye-sensitized solar cell, comprising:
a first transparent substrate;
a second transparent substrate, wherein a receiving space is formed between the second transparent substrate and the first transparent substrate;
a working electrode disposed on the first transparent substrate and located inside the receiving space;
exactly three semiconductor layers consisting of a first semiconductor layer, a second semiconductor layer, and a third semiconductor layer, wherein:
the first semiconductor layer is disposed on the working electrode and located inside the receiving space, wherein the first semiconductor layer has a first thickness and comprises a plurality of first semiconductor particles, and the plurality of first semiconductor particles have a first average particle diameter, wherein the first average particle diameter is between 21 and 25 nm, and the first thickness is between 1 and 2.73 μm;
the second semiconductor layer is disposed on the first semiconductor layer and located inside the receiving space, wherein the second semiconductor layer has a second thickness and comprises a plurality of second semiconductor particles, and the plurality of second semiconductor particles have a second average particle diameter, wherein the second average particle diameter is between 410 and 450 nm, and the second thickness is between 1 and 2.73 μm; and
the third semiconductor layer is disposed on the second semiconductor layer and located inside the receiving space, wherein the third semiconductor layer has a third thickness and comprises a plurality of third semiconductor particles, and the plurality of third semiconductor particles have a third average particle diameter, wherein the third average particle diameter is between 15 and 18 nm, wherein the third thickness is between 6.51 and 7 μm;
a counter electrode disposed on the second transparent substrate and located inside the receiving space;
a light-transmitting catalyst layer disposed on the counter electrode and located inside the receiving space, wherein material of the light-transmitting catalyst layer comprises platinum, and a thickness of the light-transmitting catalyst layer is between 5 and 15 nm; and
a liquid electrolyte filled in the receiving space.

### Claim 2 (depends on 1)

The bifacial light-harvesting dye-sensitized solar cell according to claim 1, wherein material of any one of the first semiconductor layer, the second semiconductor layer, and the third semiconductor layer comprises any one of titanium dioxide, tin dioxide, nickel oxide, and zinc oxide.