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High efficient organic photovoltaic devices utilizing work-function tuned graphene oxide derivatives as the anode and cathode charge extraction layer
| Content Provider | Semantic Scholar |
|---|---|
| Author | Konios, Dimitrios Kakavelakis, George Petridis, Costantinos Savva, Kyriaki Stratakis, Emmanuel Kymakis, Emmanuel |
| Copyright Year | 2018 |
| Abstract | The effective utilization of work-function (WF) tuned solution processable graphene-based derivatives as both hole and electron transport layers in organic photovoltaic (OPV) devices is demonstrated. The systematic tuning of functionalized graphene oxide (GO) WF took place by either photochlorination for WF increase, or lithium neutralization for WF decrease. In this way, the WF of the photochlorinated GO layer was perfectly matched with the HOMO level of two different polymer donors, enabling excellent hole transport. While the WF of the lithium functionalized GO was perfectly matched with the LUMO level of the fullerene acceptor, enabling excellent electron transport. The utilization of these graphene-based hole and electron transport layers in PTB7:PC71BM active layer devices, led to ~19% enhancement in power conversion efficiency (PCE) compared to the reference graphene free device, resulting in the highest reported PCE for graphene-based buffer layer OPVs of 9.14%. The proposed techniques open new paths towards novel material and interface engineering approaches for a wide range of new applications, including flexible electronics, OPVs, perovskite solar cells, organic light emitting diodes, and photosensors, as well as traditional electronic devices. During the past decade, OPV devices based on the bulk heterojunction (BHJ) blend have attracted great interest due to their potential for low fabrication cost but, more importantly their versatility for large-scale fabrication on flexible substrates. Despite the numerous studies on OPVs, their power conversion efficiency (PCE) compared to the silicon and other inorganic materials based photovoltaic technologies remains relatively low (~10%). Aiming to improve the competitiveness of OPVs, extensive research effort has been devoted to the interface engineering of devices and especially to the introduction of charge extracting interlayers between the BHJ layer and the electrodes. 6,7 In contrast to inorganic PVs where surface doping is responsible for Ohmic contacts, OPVs require alternative strategies in terms of the interface engineering. The introduction of buffer layers with electron and hole blocking (or transport) |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://nano.teicrete.gr/wp-content/uploads/grapheneflagship/2.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
