Open-Circuit Voltage in Organic Solar Cells: The Impacts of Donor Semicrystallinity and Coexistence of Multiple Interfacial Charge-Transfer Bands

2017 ◽  
Vol 7 (12) ◽  
pp. 1601995 ◽  
Author(s):  
Guy O. Ngongang Ndjawa ◽  
Kenneth R. Graham ◽  
Sonya Mollinger ◽  
Di M. Wu ◽  
David Hanifi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Interfacial Charge Transfer ◽  
Interfacial Charge

Relating open-circuit voltage losses to the active layer morphology and contact selectivity in organic solar cells

2018 ◽  
Vol 6 (26) ◽  
pp. 12574-12581 ◽  
Author(s):  
Zheng Tang ◽  
Jing Wang ◽  
Armantas Melianas ◽  
Yang Wu ◽  
Renee Kroon ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Active Layer ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Charge Transfer State ◽  
Open Circuit Voltages ◽  
Transfer State

By manipulating the active-layer morphologies in OSCs, we achieve different open-circuit-voltages without affecting the energy of charge-transfer state.

Study of Interfacial Charge Transfer Loss in Hybrid Solar Cells by Impedance Spectroscopy

2015 ◽  
Vol 827 ◽  
pp. 162-167 ◽  
Author(s):  
Rahmat Hidayat ◽  
Yolla Sukma Handayani ◽  
Priastuti Wulandari
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Impedance Spectroscopy ◽  
Organic Solar Cells ◽  
Transport Layer ◽  
Hybrid Solar Cells ◽  
Interfacial Charge Transfer ◽  
Metal Doped ◽  
Photovoltaic Characteristics ◽  
Interfacial Charge

Organic solar cells have been much studied because of the simplicity in their fabrication process in comparison to solar cells based on crystalline inorganic semiconductors. However, the actual power conversion efficiency is still much lower than the theoretical prediction, which may indicate the effect of inefficient charge transfer or charge recombination loss inside the cell. We have studied the photovoltaic characteristics of hybrid solar cells with transition metal doped ZnO layer as electron transport layers. Under dark condition, their J-V curves show a deviation from an ideal diode characteristic, which is indicated by current flow below the threshold voltage. Further investigations to clarify the photovoltaic characteristics of those cells were then carried out by the measurements of impedance spectroscopy. The impedance characteristics are dependent on the transport layer used, where the Nyquist plots of cells with TiZO exhibit larger impedance than those of cells with ZnO. However, those cells with larger impedance show better working performances. This fact was then interpreted as the result from smaller interfacial charge transfer loss, which may take place via charge carrier recombination at the interface of the transport layer and active layer, in the cells with TiZO.

Importance of interfacial crystallinity to reduce open-circuit voltage loss in organic solar cells

2019 ◽  
Vol 115 (15) ◽  
pp. 153301 ◽  
Author(s):  
Seiichiro Izawa ◽  
Naoto Shintaku ◽  
Mitsuru Kikuchi ◽  
Masahiro Hiramoto
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Voltage Loss
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