Dr. Tao Zhu Profile

Dr. Tao Zhu

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 16 March 2023 Presentation + Paper

Tuning of titanium dioxide surface energy levels by self-assembled monolayers for optoelectronic applications

Thierry Pauporté, Tao Zhu, Selina Olthof

Proceedings Volume 12422, 1242208 (2023) https://doi.org/10.1117/12.2647864

KEYWORDS: Perovskite, Self-assembled monolayers, Photodetectors, Titanium dioxide, Interfaces, Electric fields, Vacuum, Solar cells, Ultraviolet radiation, Photoemission spectroscopy

Read Abstract +

Tailoring the surface work function and/or surface functional group of oxide active layers in an optoelectronic device is an important means for performance improvement. One way to proceed is to adsorb molecules with varying dipole moment strength and sign. We report on the surface modification of mesoporous TiO₂ using different self-assembled monolayers (SAMs) of acids. The energetics at the interface have been determined using a series of photoelectron spectroscopy techniques (UPS, IPES, XPS). We have shown that the observed changes in work function is correlated to the dipole moments of the respective acids, calculated by density functional theory. This interfacial engineering approach can be used to control the charge extraction from an optoelectronic device. A novel approach is proposed for boosting the performances of self-powered photodetectors. Visible-blind UVA photodetectors have been built by combining a mesoporous TiO₂ layer with a Spiro-OMeTAD layer. SAMs interlayer induces a step in the vacuum energy, the formed dipole field dramatically affects the charge transfer and then the photocurrent/photoresponse of the device. The effect of para-substituted benzoic acids and β-alanine on the functioning of triple cation perovskite solar cells is then developed. We show then a best improvement for 4-chlorobenzoic acid SAMs which is due to the reduction of interfacial states, to the improvement of the quality of the perovskite material and to a better structural continuity.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years