Patent WO-2021094973-A1 (WO)
Title: Polymeric photovoltaic cell with inverted structure comprising a conjugated polymer comprising an anthradithiophene derivative
Inventor: BIANCHI GABRIELE
IPC: H01L51/44
Filed: 2020-11-12
Abstract: Polymeric photovoltaic cell (or solar cell) with inverted structure comprising: - an anode; - an anodic buffer layer; - an active layer comprising at least one photoactive organic polymer as electron-donor and at least one electron-accepting organic compound; - a cathodic buffer layer; - a cathode; wherein: - said at least one photoactive organic polymer is selected from conjugated polymers comprising an anthraditiophenic derivative having a general formula (I): wherein: - Z, equal to or different from each other, preferably equal to each other, represent a sulphur atom, an oxygen atom, a selenium atom; - Y, equal or different from each other, preferably equal to each other, represent a sulphur atom, an oxygen atom; - R 1 , equal or different from each other, preferably equal to each other, are selected from amino groups -N-R 4 R 5  wherein R 4  represents a hydrogen atom, or is selected from alkyl groups C 1 -C 20 , preferably C 2 -C 10 , linear or branched, or is selected from 20 optional substituted cycloalkyl groups and R 5  is selected from alkyl groups C 1 -C 20 , preferably C 2 -C 10 , linear or branched, or is selected from optional substituted cycloalkyl groups; are selected from R 6 -O-[CH 2 -CH 2 -O] n - polyethylenoxyl groups in which R 6  represents a hydrogen atom, or is selected from alkyl groups C 1 -C 20 , preferably C 2 -C 10 , linear or branched, and n is an integer number between 1 and 4; or are selected from -O-R 7  groups in which R 7  represents a hydrogen atom, or is selected from alkyl groups C 1 -C 30 , preferably C 2 -C 24 , linear or branched; - R 2 , equal or different from each other, preferably equal to each other, represent a hydrogen atom; or are selected from C 1 -C 20 , alkyl groups, preferably C 2 -C 10 , linear or branched; or are selected from -COR 10  groups in which R 10  is selected from C 1 -C 20  alkyl groups, preferably C 2 -C 10 , linear or branched; or are selected from -COOR 11  groups in which R 11  is selected from C 1 -C 20  alkyl groups, preferably C 2 -C 10 , linear or branched; or are selected from optional substituted aryl groups; or are selected from optional substituted heteroaryl groups; - R 3 , equal or different from each other, preferably equal to each other, represent a hydrogen atom; or are selected from C 1 -C 20 , alkyl groups, preferably C 2 -C 10 , linear or branched; or are selected from -COR 10  groups in which R 10  is selected from C 1 -C 20  alkyl groups, preferably C 2 -C 10 , linear or branched; or are selected from -COOR 11  groups in which R 11  is selected from C 1 -C 20  alkyl groups, preferably C 2 -C 10 , linear or branched; or are selected from optional substituted aryl groups; or are selected from optional substituted heteroaryl groups; - Q, equal or different from each other, preferably equal to each other, represent a nitrogen atom; or represent a C-R 3  group in which R 3  has the same meanings as above; - n is an integer number between 10 and 500, preferably between 20 and 300; - said at least organic electron-accepting compound can be selected from non-fullerenic, optionally polymeric, compounds, such as, for example, compounds based on perylene-diimides or naphthalene-diimides and fused aromatic rings; indacenotiophenes with electron-poor terminal groups; compounds having an aromatic core capable of symmetrically rotating, for example, derivatives of corannulene or truxenone. Said polymeric photovoltaic cell (or solar cell) with inverted structure shows good values of power conversion efficiency (PCE) (h)and can be advantageously used in the construction of photovoltaic modules (or solar modules), either on a rigid support or on a flexible support.