Dr. Kiran Ghimire Profile

Dr. Kiran Ghimire

at Univ of Toledo

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 | 3 March 2020 Paper

Non-contacting optical probing of photovoltaic device performance

Indra Subedi, Biwas Subedi, Prakash Uprety, Maxwell Junda, Dipendra Adhikari, Kiran Ghimire, Prakash Koirala, Robert Collins, Yanfa Yan, Nikolas Podraza

Proceedings Volume 11275, 112750J (2020) https://doi.org/10.1117/12.2550866

KEYWORDS: External quantum efficiency, Solar cells, Photovoltaics, Silicon, Perovskite, Absorption, Optical properties, Wafer-level optics, Thin films

Read Abstract +

Non-contacting optical probes based on spectroscopic ellipsometry or reflectance measurements are used to predict photovoltaic (PV) device performance and to diagnose optical and electronic losses. Optical modeling of aluminum back surface field (Al-BSF) silicon, thin film cadmium telluride (CdTe), and hybrid organic inorganic lead halide based perovskite (FA_1−xCs_xPbI₃) solar cell technologies are reviewed. Using the near infrared (IR) to ultraviolet (UV) optical properties of PV device component materials and the device structures as input, external quantum efficiency (EQE) spectra are simulated for Al-BSF, CdTe, and perovskite solar cells for comparison with experimental EQE and short circuit current density (J_SC). Optical Hall effect measurements of Al-BSF PV determine majority and minority carrier transport properties in the n+ emitter and p-type wafer silicon; from this information open circuit voltage (V_OC), fill factor (FF), J_SC, and power conversion efficiency (PCE) are calculated and agree well with direct current-voltage (J-V) electrical measurement. An IR-extended optical model for Al-BSF silicon PV includes coherent multiple reflections, ray tracing optics, and diffuse scattering and is applicable as a baseline for developing optical and thermal management strategies. Analysis of EQE for CdTe based solar cells with selenium alloying (CdSe_1−yTe_y) enables determination of absorber composition after full device processing. EQE modeling for perovskite solar cells includes the ability to account for sub gap absorption measured in films but not present in the solar cell absorber and incomplete photogenerated carrier collection in the PV device.

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