Efficient polymer:polymer bulk heterojunction solar cells

Barium: An Efficient Cathode Layer for Bulk-heterojunction Solar Cells

We report Barium (Ba) cathode layer for bulk-heterojunction solar cells which enhanced the fill factor (FF) of p-DTS(FBTTh2)2/PC71BM BHJ solar cell up to 75.1%, one of the highest value reported for an organic solar cell. The external quantum efficiency exceeds 80%. Analysis of recombination mechanisms using the current-voltage (J-V) characteristics at various light intensities in the BHJ solar...

Liquid Crystalline Polymers for Efficient Bilayer-Bulk-Heterojunction Solar Cells

The unique temperature-dependent solubility of liquid crystalline poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2b]thiophene) (PBTTT) enabled us to construct the first bilayer-bulk-heterojunction devices based on a PBTTT: PCBM (1:2)/MDMO-PPV:[70]PCBM (1:4) active layer. The bilayer device exhibited an extended optical absorption over the solar spectrum and concentration gradient that enhanced char...

Bulk Heterojunction Solar Cells — Opportunities and Challenges

Nanofi ber - Based Bulk - Heterojunction Organic Solar Cells

Bulk heterojunction organic photovoltaic (BHJ–OPV) devices have been the topic of ever increasing research efforts due to their potential to result in printable, inexpensive solar cells which can be processed onto fl exible substrates. [ 1–3 ] Typically, the active layer of the BHJ consists of an interpenetrating network of electrondonating conjugated polymers and electron-accepting fullerenes....

Hydrogen bonding in bulk heterojunction solar cells: A case study

Small molecules with dithieno[3,2-b;2',3'-d]thiophene as central building block and octyl cyanoacetate and octyl cyanoacetamide as different terminal building blocks have been designed and synthesized. The amide containing small molecule can form intermolecular hydrogen bonding between N-H...O = C of the amide group. The photovoltaic properties and active layer morphologies of the two molecules...