OPV Weight Calculator APK

All 3 modes are functional, no bugs reported
App works well on tablets (however no full-screen mode is currently supported)

This application calculates the weight of the Donor (D) and Acceptor (A) material(s) for specific D:A weight ratios, active layer concentration and solvent volume. There are three modes of operation: ‘Donor:Acceptor’ , ‘Donor1:Donor2:Acceptor’ and Donor:Acceptor1:Acceptor2’.

For each of the modes, the user defines the desired weight ‘Ratio’ between the Donor(s) and the Acceptor(s) materials followed by the ‘Active Layer Concentration’ (in g/L-1) and the ‘Solvent Volume’ (in μL). The program instantly calculates the resulting ‘Donor/Acceptor Weight’ values of the corresponding material (in mg). All fields are editable and reciprocal according to the following logic:

- When any of the three ‘Ratio’, ‘Active Layer Concentration’ or ‘Solvent Volume’ fields is modified, all the ‘Donor/Acceptor Weights’ are recalculated, while keeping the remaining two fields constant.

- When any of the ‘Donor/Acceptor Weight’ fields is modified, the rest of the ‘Donor/Acceptor Weight’ fields are re-calculated together with the ‘Solvent Volume’ field, while the ‘Ratio’ and ‘Active Layer Concentration’ values are kept constant.

Based on the last function, the application becomes very handy with materials that cannot be weighed precisely (e.g. amorphous materials) or with situations where the weighting process was wrong. The user can input the erroneous measured weight (which differs from the targeted/calculated weight) and then the application will update the solvent volume and the weight of the remaining materials, keeping the same total ratio and active layer concentration.

For single material calculations, the Donor-Acceptor mode can be used with the Donor:Acceptor ratio set to 1:0.

Each mode begins with some default values in all fields, used as an example. The reset button placed on the top left corner of every mode, restores the default values.

* If you experience problems with the input, seeing values behaving strangely try to change the input language. It is most probably caused by the difference between ‘,’ and ‘.’ among keyboards.