can you explain this photo , about p-n junction for inorganic chemistry

2 2.0 (a) of 1.5 1.0 V (V) 57 0.5 0.01 2 0 2 4 6 8 10 12 14 16 0 30 ) 1 80 120 160 200 (us) 0 100 200 300 400 (us) The p-n junction voltages under the various pulse voltages with Rstd was 10 k2 at 300 K. The charging processes of p-n junction voltage with Rstd was 1 k. (a) and 10 k 2 (b) under various magnetic fields at 80 K and the pulse voltage was kept at 6 V