Influence of light absorption profile on the performance of organic photovoltaics

Ikram Mohamed, Abdul Halim and Inche Ibrahim, Mohd Lukman (2021) Influence of light absorption profile on the performance of organic photovoltaics. IIUM Engineering Journal, 22 (2). pp. 135-148. ISSN 1511-788X E-ISSN 2289-7860

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Abstract

We investigate how an enhanced light absorption at a specific position inside the active layer affects the performance of organic photovoltaic cells (OPVs), namely the short-circuit current density (J_sc), the open-circuit voltage (V_oc), the fill factor (FF), and the power conversion efficiency (PCE). The performance is calculated using an updated version of a previously published analytical current-voltage model for OPVs, where the updated model allows the light absorption profile to be described by any functions provided that analytical solutions can be produced. We find that the light absorption profile affects the performance through the drift current. When the mobility imbalance is not very high (when the ratio of the mobility of the faster carrier type to the mobility of the slower carrier type is less than about 10^3), the PCE is maximized when the light absorption is concentrated at the center of the active layer. When the mobility imbalance is very high (when the ratio of the mobility of the faster carrier type to the mobility of the slower carrier type is more than approximately 10^4), the PCE is maximized when the light absorption is concentrated near to the electrode collecting the slower carrier type. Therefore, it is important to ensure that the light absorption profile is properly tuned so that the performance of OPVs is maximized. Morever, any efforts that we make to improve the performance should not lead to a light absorption profile that would actually impair the overall performance.

Item Type:	Article (Journal)
Additional Information:	7410/91622
Uncontrolled Keywords:	Renewable energy, solar cell
Subjects:	Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2896 Production of electricity by direct energy conversion
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Electrical and Computer Engineering Kulliyyah of Engineering > Department of Science
Depositing User:	Dr Mohd Lukman Inche Ibrahim
Date Deposited:	19 Aug 2021 09:40
Last Modified:	19 Aug 2021 09:40
URI:	http://irep.iium.edu.my/id/eprint/91622

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