The adc function on attiny44 not working as needed? - arduino

Question

enter image description hereI have been fighting alot to get this thing work but unfortunately, it is not working as needed. The sensor is extremely sensitive under little light it detect high, it has to be pitch dark in order to read low signal. Please let me know where am i wrong. I have directly connected solar panel to PA1 of ATTINY44 IC.
NOTE: Currently, I am not using any resistor with Attiny44A.
solar panel V=5V; Current=30mA.
Battery voltage = 3.7~4.2V, 1200mAH.
Here's my schematic
I don't believe that there is any power issue because i tried executing same code with 5v Arduino supply. Even if tiny bit of light falls onto it, the led turns ON.
I dont want it to be extremely sensitive
#include <avr/io.h>
int led =0;
bool Stop=false;
//int solar = 3;
void setup() {
pinMode (led, OUTPUT);
//pinMode (solar, INPUT);
ADMUX =
(1 << REFS1) | // Sets ref. voltage to Vcc, bit 1
(0 << REFS0) | // Sets ref. voltage to Vcc, bit 0 //internal 1.1v voltage reference
(0 << MUX5) | // use ADC1 for input (PA1), MUX bit 5
(0 << MUX4) | // use ADC1 for input (PA1), MUX bit 4
(0 << MUX3) | // use ADC1 for input (PA1), MUX bit 3
(0 << MUX2) | // use ADC1 for input (PA1), MUX bit 2
(0 << MUX1) | // use ADC1 for input (PA1), MUX bit 1
(1 << MUX0); // use ADC1 for input (PA1), MUX bit 0
ADCSRA =
(1 << ADEN) | // Enable ADC
(1 << ADPS2) | // set prescaler to 16, bit 2
(0 << ADPS1) | // set prescaler to 16, bit 1
(0 << ADPS0); // set prescaler to 16, bit 0
ADCSRB =
(1 << ADLAR); // left shift result (for 8-bit values)
// (0 << ADLAR); // right shift result (for 10-bit values)
}
void loop() {
ADCSRA |= (1 << ADSC); // start ADC measurement
while (ADCSRA & (1 << ADSC) ); // wait till conversion complete
//ADCH = (solar);
if (ADCH >= 128)
{
digitalWrite(led,HIGH);
//Stop=true;
}
else
{
// Stop=false;
digitalWrite (led, LOW);
// ADC input voltage is less than half of VCC
}
return 0;
}
This is my code for your reference.