Efficient inverted polymer solar cells with thermal-evaporated and solution-processed small molecular electron extraction layer

Abstract

Efficient inverted polymer solar cell is reported upon by integrating with a small molecular 1,3,5-tri(phenyl-2-benzimi-dazolyl)-benzene (TPBi) electron extraction layer (EEL) at low processing temperature with thermal-evaporation and solution-process, resulting in the power conversion efficiencies of 3.70% and 3.47%, respectively. The potential of TPBi as an efficient EEL is associated with its suitable electronic energy level for electron extraction and hole blocking from the active layer to the indium tin oxide cathode.

Electrically Pumped White‐Light‐Emitting Diodes Based on Histidine‐Doped MoS2 Quantum Dots

“…Energy level diagram for ITO, PEDOT:PSS, PVK, histidine‐doped MoS2 QDs, TPBi, and Ag before contact, and illustrated band diagram for /ITO/PEDOT:PSS/PVK/histidine‐doped MoS2 QDs/TPBi/Ag heterostructure under equilibrium are shown in Figure a,b. The positions of the highest occupied molecular orbital (HOMO), lowest unoccupied molecular orbital (LUMO) levels, workfunctions of PEDOT:PSS, PVK, TPBi, work function of Ag electrode and electron affinity of the MoS 2 were adopted from the previous works . The work function of histidine‐doped MoS 2 QDs was measured by SKPM as shown in Figure S1a,b (Supporting Information).…”

Power Conversion Efficiency Improvement of Planar Organic Photovoltaic Cells Using an Original Hybrid Electron-Transporting Layer

“… 9 For instance, even if the W F of the metal anode is small, such as that of Al with W F = 4.3 eV, when this metal is coupled with MoO 3 , the hybrid electrode Al/MoO 3 is very efficient in extracting holes. 10 Therefore, in the present work, we used MoO 3 as the HTL and we focused our interest on the cathode/electron acceptor interface. We show that it is possible to improve very significantly the inverted OPV performance using an original hybrid buffer layer.…”

“…In the case of the anode, it is necessary to have a high W F , and MoO 3 , with W F ≥ 5.3 eV, is a very efficient hole-transporting layer (HTL) . For instance, even if the W F of the metal anode is small, such as that of Al with W F = 4.3 eV, when this metal is coupled with MoO 3 , the hybrid electrode Al/MoO 3 is very efficient in extracting holes . Therefore, in the present work, we used MoO 3 as the HTL and we focused our interest on the cathode/electron acceptor interface.…”

Improved electron collection in fullerene via caesium iodide or carbonate by means of annealing in inverted organic solar cells

“…Since ITO covered the whole glass substrates, some ITO must be removed to obtain the under electrode. After masking a broad band of 25 mm by 20 mm, the ITO was etched by using Zn powder + HCl as etchant [8,9]. After scrubbing with soap, the ITO coated substrates were rinsed in running deionised water.…”

“…In the case of inverted OPVCs (IOPVCs) it was shown that the use of a MoO 3 layer thick of 6 nm allows obtaining efficient hole collection whatever is the metal of the anode [8,9]. The main aim of the present work being the study of the interface cathode/EA, we have used this classical MoO 3 /anode hole collecting structure, with Al metal electrode.…”